Hun presser leppene sammen.

Presser is the present tense of å presse.

• å presse = to press
• presser = presses / is pressing

In Norwegian, the present tense often covers both:

• She presses her lips together
• She is pressing her lips together

Unlike English, Norwegian usually does not need a special -ing form for an action happening right now.

The base form is å presse.

A few common forms are:

• å presse = to press
• presser = presses / is pressing
• presset = pressed
• har presset = has pressed

So in this sentence, presser is just the ordinary present-tense form.

Leppene is the definite plural form of leppe.

The forms are:

• en leppe = a lip
• leppa / leppen = the lip
• lepper = lips
• leppene = the lips

Norwegian often uses the definite form for body parts when it is clear whose body part is meant. Since hun is the subject, leppene naturally means her lips here.

This is very common in Norwegian with body parts.

Instead of saying something equivalent to her lips, Norwegian often just uses the definite noun:

• Hun lukker øynene. = She closes her eyes.
• Han løfter hånden. = He raises his hand.
• Hun presser leppene sammen. = She presses her lips together.

If you added a possessive, it would often sound more marked or emphatic.

Yes, but it is usually less natural in an ordinary sentence like this.

• Hun presser leppene sammen = the normal, natural way
• Hun presser sine lepper sammen = more emphatic, literary, or contrastive

Using sine can suggest emphasis, as if you are specifically highlighting that they are her own lips, not someone else’s. In everyday Norwegian, the version with leppene is preferred.

Sammen means together.

In this sentence, it shows the result of the action: the lips are being pressed together.

So:

• presse = press
• presse ... sammen = press ... together

This is very natural Norwegian for physical actions where something is brought together or closed tightly.

That is the most natural word order here.

The sentence structure is:

• Hun = subject
• presser = verb
• leppene = object
• sammen = adverb/particle-like element meaning together

So the sentence follows a very normal pattern: subject + verb + object + together/result word

Hun presser leppene sammen sounds idiomatic and natural.

It may be possible in some contexts, but Hun presser leppene sammen is the most natural and standard version for this meaning.

For a learner, it is best to remember this sentence as a set pattern:

presse leppene sammen

That is the version you are most likely to hear and use.

Here hun means she because it is the subject of the sentence.

Norwegian subject and object forms are different:

• hun = she
• henne = her

So:

• Hun presser leppene sammen. = She presses her lips together.
• Jeg ser henne. = I see her.

A rough guide is:

hoon PRESS-er LEPP-eh-neh SAHM-men

A few helpful notes:

• Hun often sounds closer to hoon than English hun
• presser has a clear ss sound
• leppene has three syllables: lep-pe-ne
• sammen has two syllables: sam-men

The r in Norwegian is usually pronounced more clearly than in many English accents, though exactly how it sounds depends on the dialect.

It can be either, depending on context.

Because Norwegian uses the present tense broadly, Hun presser leppene sammen can mean:

• She presses her lips together
  or
• She is pressing her lips together

If you are describing a scene right now, English often prefers is pressing, but Norwegian still normally uses the plain present tense.

Yes. It sounds completely natural.

It is a normal way to describe a facial expression or physical reaction, often suggesting that someone is:

• tense
• annoyed
• holding back emotion
• thinking hard
• trying not to say something

So both grammatically and stylistically, Hun presser leppene sammen is a very natural Norwegian sentence.