Låset lossnade från dörrkarmen.

Låset is the definite singular form of lås (lock, latch, or locking mechanism, depending on context).

Swedish often attaches the to the end of the noun instead of using a separate word.

• ett lås = a lock
• låset = the lock

So låset means the lock.

For the same reason: dörrkarmen is the definite singular form of dörrkarm.

• en dörrkarm = a door frame
• dörrkarmen = the door frame

The noun dörrkarm is a compound word:

• dörr = door
• karm = frame/jamb

So dörrkarmen means the door frame.

Because Swedish nouns belong to different grammatical genders.

Swedish has two main genders:

• common gender (en words)
• neuter gender (ett words)

Here:

• ett lås → låset
• en dörrkarm → dörrkarmen

So:

• neuter nouns usually take -et in the definite singular
• common gender nouns usually take -en in the definite singular

That is why the endings are different.

Lossnade is the past tense of lossna.

Lossna means something like:

• come loose
• become detached
• work itself loose

So lossnade describes something that was attached or fixed and then became loose or detached.

It is different from a verb meaning someone removed it on purpose. This verb focuses on the thing itself becoming loose.

It is usually intransitive.

That means it does not normally take a direct object.

• Låset lossnade. = The lock came loose.

If you want to say that someone loosened something, Swedish usually uses another verb, for example lossa:

• Han lossade skruven. = He loosened the screw.

A very useful contrast is:

• lossna = come loose / become loose
• lossa = loosen / detach something

Från means from.

In this sentence it marks the place something detached from:

• lossnade från dörrkarmen = came loose from the door frame

This is very natural in Swedish with verbs of separating or detaching.

Usually från is the most natural choice here.

• från = from, showing separation from a surface, object, or place

Ur usually means out of, so it fits better when something comes out from inside something:

• Nyckeln lossnade ur låset. = The key came loose out of the lock.

Av can sometimes appear with verbs of falling or being torn off, but with lossna in this sentence, från is the normal and safest choice.

So for the lock came loose from the door frame, från is the expected preposition.

This is standard Swedish main-clause word order:

• subject: Låset
• verb: lossnade
• prepositional phrase: från dörrkarmen

So the pattern is basically:

Subject + Verb + Other information

That is the most neutral word order in a statement.

Yes, it could:

• Från dörrkarmen lossnade låset.

This is grammatically correct, but it sounds more marked or stylistic. It puts extra focus on from the door frame.

Notice what happens in Swedish: the finite verb still stays in the second position.

So if you move Från dörrkarmen to the front, the verb lossnade must come next:

• Från dörrkarmen lossnade låset.

Not:

• Från dörrkarmen låset lossnade. ❌

This is part of the Swedish V2 rule.

The dictionary forms are:

• låset → lås (noun)
• lossnade → lossna (verb)
• från → från (preposition)
• dörrkarmen → dörrkarm (noun)

So if you want to look these up, search for:

• lås
• lossna
• från
• dörrkarm

The infinitive is lossna.

The past tense is made by replacing the final -a with -ade:

• lossna → lossnade

This is a very common Swedish past tense pattern for verbs of the first conjugation.

Related forms:

• infinitive: lossna
• present: lossnar
• past: lossnade
• supine: lossnat

Example:

• Låset har lossnat. = The lock has come loose.

Not necessarily just a key lock.

Lås can refer to different kinds of locking or fastening mechanisms depending on context. In a sentence like this, låset could mean:

• the lock mechanism
• the latch/fastening part
• the whole lock assembly

So the exact image depends on the situation.

It would be:

• Ett lås lossnade från en dörrkarm.

That means a lock came loose from a door frame.

Compare:

• Låset lossnade från dörrkarmen. = specific lock, specific door frame
• Ett lås lossnade från en dörrkarm. = nonspecific lock, nonspecific door frame

The original sentence uses definite forms, so it refers to something specific or already known in context.

A rough English-friendly guide would be:

• låset ≈ LOH-set
• lossnade ≈ LOSS-na-deh
• från ≈ frohn
• dörrkarmen ≈ DURR-kar-men

A few important notes:

• å sounds roughly like the vowel in British law
• ö has no exact English equivalent; it is somewhat like the vowel in bird for some speakers, but with rounded lips
• Swedish r can vary by dialect
• the k in karmen is a normal hard k

This is only approximate, but it can help you get started.

It would not be the natural way to say it.

Låset lossnade från dörrkarmen is much better because it expresses that the lock came loose.

blev löst would sound odd here, because lös means loose, but bli lös is not the normal idiomatic choice in this situation. Swedish strongly prefers the verb lossna for this kind of change.

So for natural Swedish, stick with:

• Låset lossnade från dörrkarmen.