upptäcka means "to discover, to find out, to notice." It is built from the particle-turned-prefix upp- ("up") plus täcka ("to cover") — literally "to un-cover," to take the lid off something hidden. (It is a calque of German aufdecken.) That image is the key to its meaning: upptäcka is about realising or uncovering something — a mistake, a fact, a new place, a feeling — not about locating a lost object, which is hitta. It is a regular Group 2 verb: upptäcker – upptäckte – upptäckt.
Principal parts
| Infinitive | Present | Preteritum (past) | Supine | Imperative | Group |
|---|---|---|---|---|---|
| upptäcka | upptäcker | upptäckte | upptäckt | upptäck | Group 2 (-te), from täcka |
The stem is upptäck-, ending in the cluster ck after a short vowel. Because k is voiceless, the past takes -te: upptäck- + -te = upptäckte, and the supine is upptäckt. The present is upptäcker and the bare-stem imperative is upptäck! The participle agrees: en nyligen upptäckt art (en-word), ett upptäckt fel (ett-word), upptäckta misstag (plural). The upp- prefix here is fused and inseparable — unlike the separable particle in, say, skriva ut.
Jag upptäcker hela tiden nya saker i den här staden.
I keep discovering new things in this city. upptäcker — present, Group 2.
Vi upptäckte felet först när räkningen kom.
We didn't discover the mistake until the bill arrived. upptäckte — the regular -te past.
Forskarna har upptäckt en helt ny art.
The researchers have discovered an entirely new species. har upptäckt — supine after har.
Use 1: discover / find out / notice
upptäcka covers everything from a scientific discovery to suddenly noticing you've left the stove on. The common thread is a shift from not-knowing to knowing — you uncover the fact. Typical objects: upptäcka ett fel, ett problem, en ny plats, en talang, sanningen.
Hon upptäckte en talang för att rita som vuxen.
She discovered a talent for drawing as an adult. upptäckte — uncovering something about oneself.
Tjuven upptäcktes av en granne.
The thief was spotted by a neighbour. upptäcktes — the passive -s form: 'was discovered/spotted'.
Plötsligt upptäckte jag att plånboken var borta.
Suddenly I noticed my wallet was gone. upptäcka att — realising a fact.
Use 2: upptäcka att — realising a fact
A very frequent frame is upptäcka att + a clause: you find out, realise, or come to notice that something is the case. This is the "find out" sense, and it slots in wherever English would say "I realised that…" or "it turned out that…".
Jag upptäckte att jag hade glömt nycklarna hemma.
I realised I'd left the keys at home. upptäcka att — finding out a fact.
När vi kom fram upptäckte vi att hotellet var fullbokat.
When we arrived we found out the hotel was fully booked. upptäcka att — past, 'discover that'.
Use 3: the noun en upptäckt — a discovery
The noun is en upptäckt (plural upptäckter), "a discovery, a find." Note it is identical in spelling to the supine form upptäckt — context and the article (en) tell them apart. Göra en upptäckt = "to make a discovery."
Det var en upptäckt som förändrade hela forskningsfältet.
It was a discovery that changed the whole field of research. en upptäckt — the noun.
Barn gör nya upptäckter varje dag.
Children make new discoveries every day. upptäckter — plural noun; note göra, not 'do'.
upptäcka vs hitta
The pair English flattens into "find." hitta is to locate a physical thing — your keys, the way, a café. upptäcka is to realise or uncover something — a mistake, a fact, a new place's existence. If you've been searching for your phone and it turns up, you hittade it; if you suddenly notice it's cracked, you upptäckte the crack.
Jag hittade till slut nycklarna under soffan.
I finally found the keys under the sofa. hitta — locating a lost physical thing.
Jag upptäckte att nyckeln var trasig.
I discovered that the key was broken. upptäcka — realising a fact, not locating an object.
Common Mistakes
❌ Vi upptäckade felet för sent.
Incorrect — upptäcka is Group 2 (-te), so the past is upptäckte, never *upptäckade.
✅ Vi upptäckte felet för sent.
We discovered the mistake too late.
❌ Jag har upptäckat något konstigt.
Incorrect — the supine is upptäckt, not *upptäckat.
✅ Jag har upptäckt något konstigt.
I've discovered something strange.
❌ Jag upptäckte mina nycklar under soffan. (for locating)
Wrong verb — to locate a lost physical thing is hitta; upptäcka is to realise/uncover.
✅ Jag hittade mina nycklar under soffan.
I found my keys under the sofa.
❌ Det var en stor upptäck för vetenskapen.
Wrong noun — the noun is en upptäckt (with -t), not *en upptäck (that's the imperative).
✅ Det var en stor upptäckt för vetenskapen.
It was a great discovery for science.
❌ Jag täckte upp att jag hade fel. (splitting the prefix)
Off — the fused verb is upptäcka; don't break it into a particle verb here.
✅ Jag upptäckte att jag hade fel.
I realised I was wrong.
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