Innsnittet sitter veldig høyt.

Because innsnittet is the definite singular form of the noun et innsnitt.

• et innsnitt = an innsnitt
• innsnittet = the innsnitt

The ending -et is a common definite ending for neuter nouns in Norwegian.

It is singular.

A quick overview of the forms:

• et innsnitt = singular indefinite
• innsnittet = singular definite
• innsnitt = plural indefinite
• innsnittene = plural definite

So in this sentence, we are talking about one specific innsnitt.

In Norwegian, sitte is often used when talking about how something is positioned, placed, or fitting on something, especially in clothing and body-related contexts.

So sitter veldig høyt means something like:

• is positioned very high
• sits very high
• falls very high

This is more idiomatic than using er in many similar situations.

You might hear or understand it, but sitter is usually the more natural choice here.

The difference is roughly:

• sitter focuses on placement/fall/fit
• er sounds more like a plain statement that something is high

When talking about clothing details and where they are placed on a garment or body, Norwegian often prefers sitte.

Here, høyt is used in an adverb-like way to describe how/where it sits.

Compare:

• Hun er høy. = She is tall.
  Here høy is an adjective describing a person.
• Innsnittet sitter høyt. = The innsnitt sits high.
  Here høyt describes the position.

A useful pattern to remember is that Norwegian often uses the -t form of an adjective in this kind of expression:

• lavt = low
• høyt = high
• fint = nicely / well

So sitter høyt is the natural form.

Veldig means very and intensifies høyt.

So:

• høyt = high
• veldig høyt = very high

Its placement is normal: it comes right before the word it modifies.

No, this is very normal Norwegian main-clause word order:

• Innsnittet = subject
• sitter = finite verb
• veldig høyt = adverbial description

So the structure is:

Subject + verb + adverbial

This also fits the general Norwegian V2 rule: in a main clause, the finite verb is in the second position.

It can mean different things depending on context.

For example:

• sitter høyt = sits high
• snakker høyt = speaks loudly

So høyt can mean either:

• high / up high
• loudly

In your sentence, because of sitter, it clearly means high up, not loudly.

It is a neuter noun, which is why the indefinite article is et:

• et innsnitt

That matters because neuter nouns often affect forms like:

• definite singular: innsnittet
• some adjective forms used with them

So it is useful to learn the noun together with its article: et innsnitt.