You can know every word in a Dutch sentence and still have no idea what it means — because Dutch, like every language, is stitched together with fixed expressions whose meaning isn't the sum of their parts. Iets onder de knie hebben word-for-word is "to have something under the knee," but it means "to have mastered something." This group is your guide to that hidden layer: the idioms, sayings, and fixed collocations that native speakers reach for constantly and that textbooks rarely teach systematically. This overview page maps the territory — what the categories are, why they resist literal translation, the themes they cluster around, and how to handle their frozen form and register.
The three categories
Dutch fixed language comes in three overlapping types, and it helps to keep them straight:
- uitdrukkingen (idioms) — figurative phrases whose meaning can't be derived from the words: de kat uit de boom kijken ("to wait and see"), de plank misslaan ("to be completely wrong"). The grammar can flex (you conjugate the verb), but the imagery is fixed.
- spreekwoorden / gezegden (proverbs / sayings) — complete little sentences carrying folk wisdom: De appel valt niet ver van de boom ("the apple doesn't fall far from the tree"). These are usually frozen whole, often in the gnomic present, and you quote them unchanged.
- vaste verbindingen (fixed collocations) — words that simply go together by convention: honger hebben ("to be hungry"), een beslissing nemen ("to make a decision," literally "to take a decision"). Nothing figurative here, but you can't swap the verb for a synonym.
Hij heeft het nu wel een beetje onder de knie.
He's pretty much got the hang of it now. (uitdrukking — 'onder de knie hebben' = to master, nothing to do with knees)
Een beslissing nemen kost soms tijd.
Making a decision sometimes takes time. (vaste verbinding — Dutch 'takes' a decision: 'een beslissing nemen', not 'maken')
Why they don't translate literally
The defining feature of an idiom is that its meaning is non-compositional — you cannot build it up from the individual words. This is exactly why machine-translating an idiom, or calquing one from English, produces gibberish or, worse, the wrong idiom. English "to kick the bucket" has nothing to do with buckets; Dutch het loodje leggen ("to lay down the little lead weight" = to die) has nothing to do with lead. You have to learn each one as a whole.
Nu komt de aap uit de mouw.
Now the truth comes out / now we see what's really going on. (literally 'now the monkey comes out of the sleeve' — a classic non-translatable image)
Dat is een storm in een glas water.
That's a storm in a teacup. (here English and Dutch share an image, but 'glas water' = glass of water, not 'teacup' — even the matches don't match word for word)
Recurring themes
Dutch idioms aren't random — they cluster around a handful of source domains drawn from the country's history and daily life. Recognising the themes makes new idioms easier to absorb:
| Theme | Example idiom | Meaning |
|---|---|---|
| Body parts | iets onder de knie hebben | to have mastered something |
| Body parts | je hart op je tong hebben | to wear your heart on your sleeve |
| Animals | de kat uit de boom kijken | to wait and see |
| Animals | een kat in de zak kopen | to be conned / buy a dud |
| Food | ergens geen kaas van gegeten hebben | to know nothing about something |
| Weather | het regent pijpenstelen | it's pouring / raining cats and dogs |
| Water / sea | met iemand in zee gaan | to team up / do business with someone |
| Water / sea | het hoofd boven water houden | to keep your head above water (stay afloat) |
The water and sea cluster is especially telling: a nation that fought the sea for a thousand years naturally talks about teaming up as in zee gaan ("going to sea together") and surviving as het hoofd boven water houden. The food cluster leans on cheese — ergens geen kaas van gegeten hebben ("to have eaten no cheese of something" = to know nothing about it) is unmistakably Dutch.
Daar heb ik geen kaas van gegeten.
I don't know the first thing about that. (food theme — 'geen kaas van gegeten hebben' = to know nothing about it)
We gaan met die leverancier in zee.
We're going to do business with that supplier. (water/sea theme — 'in zee gaan met' = to team up with)
Fixed form: don't alter it
The most important practical rule: idioms are frozen. You don't swap a word for a synonym, change the number, switch the preposition, or reorder the parts — even when a substitution seems perfectly logical. Het regent pijpenstelen ("it's raining pipe-stems") cannot become het regent buizen even though buis also means "pipe." The article, the preposition, the exact noun: all fixed.
Het regent pijpenstelen.
It's pouring down. (fixed form — you cannot substitute another word for 'pijpenstelen')
Hij sloeg de plank volledig mis.
He was completely wide of the mark. ('de plank misslaan' = to be totally wrong; 'de plank' is fixed — not 'een plank')
What can change is the grammar that the idiom requires: you conjugate the verb for tense and person, and you obey normal word-order rules (the finite verb moves to the end in subordinate clauses). But the lexical core stays put. See idiomatic-fixed-syntax for the deeper cases where even the syntax is frozen.
Register: not all idioms are casual
Idioms span the full register range, and using one in the wrong setting is a real mistake:
- (informal) — balen ("to be fed up"), de slappe lach hebben ("to have a fit of the giggles"). Fine in conversation, out of place in a formal report.
- neutral — de kat uit de boom kijken, de knoop doorhakken ("to cut the knot" = to make a decisive choice). Usable almost anywhere.
- (formal / literary) — many spreekwoorden read as slightly elevated or proverbial: Wie a zegt, moet ook b zeggen ("in for a penny, in for a pound").
- (vulgar) — exists too; you should recognise crude idioms even if you don't use them.
Kom op, hak nou de knoop door!
Come on, just make a decision! ('de knoop doorhakken' = to make a decisive choice — neutral register, very common)
Wie a zegt, moet ook b zeggen.
If you say A, you must also say B (= once you start something, you must see it through). A proverbial saying, slightly formal/elevated.
How this group is organised
The pages in this Expressions group take the idioms theme by theme and verb by verb, so you build them up in clusters rather than as a random list. The companion page Idioms with Hebben is the place to start: Dutch uses the verb hebben ("to have") where English uses "to be" for a whole family of states — honger hebben ("to be hungry"), het koud hebben ("to be cold"), gelijk hebben ("to be right") — and getting that pattern wrong is one of the most common errors English speakers make.
Ik heb honger; zullen we wat eten?
I'm hungry; shall we eat something? (preview of the hebben pattern — Dutch 'has' hunger where English 'is' hungry)
Common Mistakes
❌ Het regent katten en honden.
Incorrect — a calque of English 'raining cats and dogs'. Dutch says 'het regent pijpenstelen'.
✅ Het regent pijpenstelen.
It's pouring down.
❌ Hij sloeg een plank mis.
Incorrect — the idiom takes the fixed 'de plank', not 'een plank'. You can't change the article.
✅ Hij sloeg de plank mis.
He was completely wrong.
❌ Daar heb ik geen brood van gegeten.
Incorrect — the fixed word is 'kaas' (cheese), not 'brood'. Idioms don't accept synonym swaps.
✅ Daar heb ik geen kaas van gegeten.
I don't know the first thing about that.
❌ We gaan met die leverancier naar zee.
Incorrect preposition — the idiom is 'in zee gaan met', not 'naar zee'. The preposition is part of the fixed form.
✅ We gaan met die leverancier in zee.
We're going to do business with that supplier.
❌ Using 'de slappe lach hebben' in a formal business email.
Register mismatch — this is informal/colloquial. In formal writing, choose a neutral phrasing instead.
✅ Reserve informal idioms for casual speech; use neutral or formal ones in formal writing.
Match the idiom's register to the setting.
Key Takeaways
- Dutch fixed language splits into uitdrukkingen (idioms), spreekwoorden/gezegden (proverbs/sayings), and vaste verbindingen (fixed collocations).
- Idiom meaning is non-compositional — learn the whole chunk plus its meaning; never translate word for word or calque from English.
- Idioms cluster by theme: body parts, animals, food, weather, and — very Dutch — water and the sea.
- The lexical form is frozen (no synonym swaps, no preposition changes, no reordering); only the verb conjugates and obeys normal word order.
- Idioms carry register — from (informal) to (formal/literary); match them to the setting.
Related Topics
- Idioms with Hebben: Honger hebben, Gelijk hebben, Zin hebbenA2 — A family of Dutch expressions where 'hebben' (to have) does the work English assigns to 'to be': honger/dorst hebben (be hungry/thirsty), het koud/warm hebben (be cold/warm), gelijk hebben (be right), zin hebben in/om (feel like), haast hebben (be in a hurry), het druk hebben (be busy), last hebben van (suffer from). The page explains the underlying logic — Dutch treats these states as things you HAVE, not things you ARE — and drills the 'het'-cases and the 'zin hebben in' vs 'zin hebben om te' split.
- Idiomatic and Fixed Syntactic PatternsC2 — The frozen syntactic idioms of advanced Dutch — hoe dan ook, om nog maar te zwijgen van, voor je het weet, als het ware — phrases with locked-in internal word order and meanings that don't decompose, learned whole rather than built from rules.
- Expression: De kat uit de boom kijkenB2 — A full analysis of the genuine Dutch idiom 'de kat uit de boom kijken' (to wait and see, hold back until it's clear which way things will go): its image, its meaning, the verb 'kijken' and how the whole phrase behaves as a unit, main-clause and subordinate-clause word order, literal vs figurative reading, and related cat idioms like 'een kat in de zak kopen' and 'als de kat van huis is, dansen de muizen'.
- How Dutch Proverbs Work (Annotated)B1 — An overview of how Dutch proverbs (spreekwoorden) and sayings (gezegden) are built, with genuine traditional examples analysed grammatically: free relatives ('Wie A zegt, moet ook B zeggen'), ellipsis ('Oost west, thuis best'), gnomic present tense ('Hoge bomen vangen veel wind'), and fixed comparative syntax ('Beter een vogel in de hand dan tien in de lucht'). Learn why you must never translate or alter them word for word.