Sømskaden gjør passformen dårlig.

Because Norwegian forms compounds very freely, and they are usually written as one word.

• sømskade = søm
  • skade
• passform = pass
  • form

This is very normal in Norwegian. Where English might use two words, Norwegian often prefers one compound word.

The ending -en marks the definite singular form for many common-gender nouns in Bokmål.

• en sømskade → sømskaden = the seam damage
• en passform → passformen = the fit

So the sentence is talking about a specific seam damage and a specific fit, not just seam damage or fit in general.

The dictionary forms are the indefinite singular forms:

• sømskade
• passform

That is how you would normally look them up in a dictionary.

Gjør is the present tense of gjøre, which often means do, but it can also mean make in the sense of cause something to become a certain way.

Here the pattern is:

gjøre + object + adjective

So:

• Sømskaden gjør passformen dårlig
• literally: The seam damage makes the fit bad/poor

This is a very common structure in Norwegian, similar to English make something worse/better/easier/harder.

Because dårlig is a predicative/object-complement adjective here, and it agrees with passformen as a singular common-gender noun.

Important point: in this kind of use, the adjective does not take a special definite ending just because the noun is definite.

Compare:

• en passform er dårlig
• passformen er dårlig

Both use dårlig, not dårlige.

You would use dårlige with plural:

• passformene er dårlige

It is an adjective here.

It describes passformen, not the verb gjør.

So the structure is:

• sømskaden = subject
• gjør = verb
• passformen = object
• dårlig = object complement describing passformen

A useful English comparison is:

• This makes the fit poor
• This makes the fit bad

Yes. That is also correct.

There is a small difference in style:

• Sømskaden gjør passformen dårlig = more compact and direct
• Sømskaden gjør at passformen blir dårlig = a little more explicit, with a full clause after gjør at

Both are natural, but the original sentence is shorter and tighter.

Because Norwegian usually expresses definiteness by adding it to the noun itself.

So instead of saying:

• the seam damage
• the fit

Norwegian says:

• sømskaden
• passformen

This is one of the biggest structural differences from English.

The basic word order is:

Subject + Verb + Object + Complement

So here:

• Sømskaden = subject
• gjør = verb
• passformen = object
• dårlig = complement

This is a very normal main-clause pattern in Norwegian.

Yes, but that would change the meaning slightly.

For example:

• En sømskade gjør passformen dårlig

This sounds more general: A seam damage / seam defect makes the fit poor.

The original:

• Sømskaden gjør passformen dårlig

sounds like we are talking about a particular seam damage and the fit of a particular item.

So the definite forms help make the sentence specific.