Idioms with the Body and Everyday Objects | Icelandic Grammar

A body-part idiom is a phrase that recruits a physical part — head, heart, hand, eye — to talk about something abstract: thinking, courage, effort, vigilance. Every language has them ("keep your head," "lend a hand," "by heart"), but each language freezes its own selection, and crucially each one freezes a specific grammatical shape: a particular case on the noun, a particular preposition, a particular article. In Icelandic, where case still does heavy lifting, getting that frozen shape right is the whole game. This page walks through the most useful, well-attested body and object idioms — what they picture, what they mean, and exactly which case they lock in — so you can store each one as a single unit rather than reassembling it (wrongly) from its parts.

A warning the whole page turns on: an idiom is frozen. You cannot swap höfuð for haus, or acc for dat, just because it would be grammatical — you must reproduce the form native speakers actually use. Every idiom below has been checked against Icelandic reference sources; if you meet one elsewhere that you can't verify, treat it with the same care.

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Store every idiom as three things at once: the words, the governed preposition, and the case it forces. hafa auga með is not learned until you've learned the + dative that með drags along; leggja höfuðið í bleyti is not learned until you've learned the accusative on höfuðið. Half a learned idiom betrays you the moment you add the object.

Head: leggja höfuðið í bleyti and halda haus

The head is where Icelandic, like English, locates thinking and composure — but the images are entirely its own.

Að leggja höfuðið í bleyti literally says "to lay the head into soak/wet" and means to think hard, to rack one's brains, to ponder a problem thoroughly. The grammar is frozen: höfuðið is accusative (the object of leggja, with the definite article suffixed), and í bleyti is "into the wet." The image rewards a moment's attention. According to the Árni Magnússon Institute's explanation, the picture draws on the old contrast between wet and dry: what is wet and damp is fertile and productive, what is dry is barren — so "putting your head to soak" means setting it up to produce fresh, nourishing ideas, the opposite of being "dried out" with nothing to say. There is no English idiom that pictures thinking this way, which is exactly why it's worth knowing.

Við þurfum að leggja höfuðið í bleyti og finna lausn fyrir mánudag.

We need to put our heads together / rack our brains and find a solution by Monday. — höfuðið is accusative; the phrase is frozen as leggja höfuðið í bleyti.

Ég lagði höfuðið í bleyti alla helgina en datt ekkert sniðugt í hug.

I racked my brains all weekend but couldn't think of anything clever. — note the accusative höfuðið, never *höfuðinu.

Að halda haus (also halda höfði) means to keep one's head, to keep one's composure, to stay afloat under pressure or hardship — emotionally holding it together when things are hard. It overlaps neatly with English "keep your head," which makes it easy to remember, though Icelandic uses it broadly for weathering difficulty, not just for staying calm in a crisis.

Þetta hefur verið erfitt ár, en hún hefur náð að halda haus.

It's been a hard year, but she's managed to keep her head / stay afloat. — halda haus, frozen with the bare noun haus.

Maður reynir bara að halda haus þangað til þetta gengur yfir.

You just try to keep your head until this blows over. — the everyday, slightly informal form with haus.

Note the register split inside the head-words themselves: höfuð is the neutral word for "head," while haus is more colloquial (and is the ordinary word for an animal's head). Halda haus leans (informal); halda höfði is its more neutral twin. But you cannot freely substitute across idioms — leggja höfuðið í bleyti keeps höfuð, and swapping in haus sounds off even though haus means "head."

Eye and restraint: hafa auga með and hafa hemil á

Two high-frequency idioms both lock in the dative, and both are about control and watchfulness.

Að hafa auga með (+ dative) means to keep an eye on, to watch over, to look after. The dative is forced by the preposition með ("with"), which governs the dative case — so whatever you're watching appears in the dative: hafa auga með börnunum "keep an eye on the children." This maps almost perfectly onto English "keep an eye on," with the one difference that English uses "on" and Icelandic uses "with."

Geturðu haft auga með börnunum á meðan ég skrepp í búð?

Can you keep an eye on the children while I pop to the shop? — börnunum is dative after með; hafa auga með + dat.

Hann hafði vakandi auga með öllu sem gerðist á svæðinu.

He kept a watchful eye on everything that happened in the area. — öllu in the dative, governed by með.

Að hafa hemil á (+ dative) means to keep in check, to control, to keep a lid on — emotions, spending, a crowd, a situation. A hemill is a brake or restraint (the same word is used for a brake on a vehicle and historically for hobbling a horse), so the image is literally "to have a brake/restraint on" something. Again á here governs the dative in this idiom: hafa hemil á skapinu "keep one's temper in check," hafa hemil á útgjöldunum "keep spending under control."

Hann þarf að læra að hafa hemil á skapi sínu.

He needs to learn to keep his temper in check. — skapi is dative; hafa hemil á + dat.

Það var erfitt að hafa hemil á mannfjöldanum eftir leikinn.

It was hard to keep the crowd under control after the match. — mannfjöldanum dative.

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Both hafa auga með and hafa hemil á take the dative — but for different reasons. með always governs the dative, so auga með is predictable; á usually alternates accusative/dative, but in hafa hemil á it is frozen as dative. Learn the dative as part of the chunk and you'll never have to reason it out mid-sentence.

Hand and heart: leggja hönd á plóginn and af heilum hug

Að leggja hönd á plóginn literally "to put a hand to the plough" means to pitch in, to lend a hand, to do one's share of the work. Here hönd is accusative and á plóginn ("onto the plough," accusative of motion) completes the image. This one has a traceable origin: it echoes the Gospel saying (Luke 9:62) about no one who puts a hand to the plough and looks back being fit for the kingdom — so the picture is the labourer who commits to the work of the field. English has the cousin "put your hand to the plough," but in everyday Icelandic the phrase is the ordinary way to say "everybody help out."

Ef allir leggja hönd á plóginn klárum við þetta fyrir kvöldmat.

If everyone pitches in, we'll finish this before dinner. — hönd accusative, á plóginn accusative; the phrase is fixed.

Sjálfboðaliðar lögðu hönd á plóginn við hreinsunina eftir óveðrið.

Volunteers lent a hand with the clean-up after the storm. — note the singular hönd, not *hendur.

Af heilum hug literally "from a whole mind/heart" means wholeheartedly, sincerely, in earnest. Hugur is "mind, heart, intent," and af heilum hug is frozen with the dative (governed by af) and the adjective heilum "whole" agreeing with it. It's the idiom you reach for to stress that you mean something genuinely, with no reservation — close to English "wholeheartedly" or "in good faith."

Ég þakka þér af heilum hug fyrir alla hjálpina.

I thank you wholeheartedly for all the help. — af heilum hug, dative, frozen.

Hún studdi málið af heilum hug frá fyrsta degi.

She backed the cause wholeheartedly from day one. — the phrase signals genuine, unreserved commitment.

An object idiom: taka af skarið

Not every idiom uses the body. Að taka af skarið means to take the decisive step, to settle the matter, to make the call — to cut through hesitation and act. The image is from the age of candle-light: the skar is the charred, burnt end of a candle wick, which makes the flame smoke and dim; to take off the skar — trim the burnt tip — is to let the candle burn bright and clear again. So "taking off the burnt wick" became "removing what's holding things up and letting the matter move forward." It's attested in Icelandic since the 18th century, and there's no English idiom with this exact picture; the nearest equivalents are "take the plunge" or "make the decisive move."

Enginn þorði að ákveða neitt, svo ég tók bara af skarið og bókaði ferðina.

Nobody dared decide anything, so I just took the plunge and booked the trip. — taka af skarið, fixed; skarið is the burnt wick-end.

Stjórnin verður að taka af skarið í þessu máli fyrir áramót.

The board has to make the decisive call on this matter before the new year. — formal-leaning use; the idiom is register-neutral.

How English speakers go wrong

Two failure modes dominate, and both come from treating an idiom as a sentence to build rather than a unit to retrieve.

Literal translation. English idioms almost never survive the crossing. You can't say halda höfðinu þínu word-for-word for "keep your head" — the idiom is halda haus / halda höfði, bare, no possessive. And "rack your brains" has no brain-and-rack version in Icelandic at all; the equivalent pictures a head set to soak. When you want the idea, reach for the Icelandic phrase you've learned whole.

Altering the frozen case or noun. Because the words look swappable, learners "improve" them — putting höfuðið in the dative, dropping the article, or substituting a synonym. Each change quietly marks the phrase as assembled, not known. The case is part of the idiom: leggja höfuðið (acc) í bleyti, hafa auga með (dat), hafa hemil á (dat).

Common Mistakes

❌ Við þurfum að leggja höfuðinu í bleyti.

Case error — höfuð is the accusative object of leggja here, so it must be höfuðið, not the dative höfuðinu.

✅ Við þurfum að leggja höfuðið í bleyti.

We need to rack our brains. — accusative höfuðið is part of the frozen idiom.

The idiom fixes höfuðið in the accusative. Don't let the abstract feel of the phrase tempt you into the dative.

❌ Geturðu haft auga með börnin?

Case error — með governs the dative, so it must be börnunum, not the accusative börnin.

✅ Geturðu haft auga með börnunum?

Can you keep an eye on the children? — dative börnunum after með.

Með always takes the dative; in hafa auga með the watched thing is therefore dative.

❌ Hann þarf að halda höfðinu sínu.

Wrong shape — the idiom is bare halda haus / halda höfði, with no possessive 'sínu'.

✅ Hann þarf að halda haus.

He needs to keep his head. — no possessive; the noun stands bare.

English forces "keep your head," but the Icelandic idiom takes no possessive: halda haus (informal) or halda höfði.

❌ Ég þakka þér af heilu hjarta.

Wrong noun — the fixed idiom is af heilum hug (mind/intent), not a calque on English 'heart'.

✅ Ég þakka þér af heilum hug.

I thank you wholeheartedly. — af heilum hug is the attested frozen form.

Don't calque English "wholeheartedly" onto hjarta. The Icelandic idiom uses hugur in the dative: af heilum hug.

❌ Allir lögðu hendur á plóginn.

Number error — the idiom is singular hönd, not plural hendur.

✅ Allir lögðu hönd á plóginn.

Everyone pitched in. — frozen singular hönd á plóginn.

The phrase is locked as singular hönd, even when many people pitch in. Pluralising it breaks the idiom.

Key Takeaways

Body and object idioms are frozen units — store each with its preposition, its case, and its exact noun; don't rebuild them from parts.
Head: leggja höfuðið (acc) í bleyti = "rack one's brains" (the wet/fertile image); halda haus / halda höfði = "keep one's head / stay afloat" (no possessive).
Dative idioms: hafa auga með (dat) = "keep an eye on" (because með takes dative); hafa hemil á (dat) = "keep in check" (hemill = a brake/restraint).
Hand/heart: leggja hönd á plóginn = "pitch in" (singular hönd; from the Gospel plough image); af heilum hug (dat) = "wholeheartedly."
Object: taka af skarið = "make the decisive move" (the skar is a candle's burnt wick-end you trim to brighten the flame).
The two classic errors are literal translation from English and altering the frozen case or noun — both mark the phrase as assembled rather than known.

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