Vi arbejder endda om søndagen.

Endda means even.

So Vi arbejder endda om søndagen means something like We even work on Sundays.

It adds emphasis and suggests that working on Sundays is surprising, unusual, or a bit extreme.

Compare:

• Vi arbejder om søndagen = We work on Sundays
• Vi arbejder endda om søndagen = We even work on Sundays

Arbejder is the present tense of at arbejde = to work.

Danish present tense is usually formed by adding -r to the infinitive:

• at arbejde = to work
• arbejder = work / am working / are working

With vi = we, Danish does not change the verb the way English does. The same present-tense form is used for all persons:

• jeg arbejder = I work
• du arbejder = you work
• vi arbejder = we work

It can mean both, depending on context.

Danish present tense often covers both the English simple present and present continuous:

• Vi arbejder = We work
• Vi arbejder = We are working

In this sentence, because of om søndagen, the natural meaning is habitual:

• Vi arbejder om søndagen = We work on Sundays

Here om is used with parts of the day, days, weekends, and similar time expressions to mean on or during.

So:

• om søndagen = on Sundays
• om morgenen = in the morning
• om aftenen = in the evening
• om vinteren = in winter

This is one of those places where Danish and English use different prepositions. English says on Sundays, but Danish says om søndagen.

In expressions like om søndagen, Danish often uses the definite singular form to talk about something habitual or repeated.

So:

• søndag = Sunday
• søndagen = the Sunday

But in this expression, om søndagen does not literally mean on the Sunday in normal English. It idiomatically means:

• on Sundays
• on Sunday(s)
• on Sundays in general

This is a very common Danish pattern.

This is an important difference:

• om søndagen = on Sundays, on Sunday(s) in general, habitually
• på søndag = this coming Sunday / next Sunday

Examples:

• Vi arbejder om søndagen = We work on Sundays
• Vi arbejder på søndag = We are working this Sunday

So in your sentence, om søndagen shows a regular habit, not one specific Sunday.

Yes, you may hear om søndage, and it can also mean on Sundays. But om søndagen is a very common and natural idiomatic way to express repeated Sundays in general.

Roughly speaking:

• om søndagen = on Sundays / on Sunday, as a general habit
• om søndage = on Sundays

Both can be understood, but om søndagen is especially common in everyday Danish.

In this sentence, endda comes after the finite verb:

• Vi arbejder endda om søndagen

That placement is natural and common.

Danish word order often puts short adverbs like this after the verb in a main clause when the subject comes first:

• Vi arbejder ofte om søndagen = We often work on Sundays
• Vi arbejder også om søndagen = We also work on Sundays
• Vi arbejder endda om søndagen = We even work on Sundays

The exact position of endda can sometimes shift depending on what is being emphasized, but the version in your sentence is very standard.

Yes:

• Om søndagen arbejder vi endda.

This is grammatical, but it changes the emphasis a bit.

When Danish starts a main clause with something other than the subject, the verb must still stay in second position. That is why you get:

• Om søndagen arbejder vi endda not
• Om søndagen vi arbejder endda

This is the usual V2 word order rule in Danish main clauses.

Still, the original sentence sounds more natural if the main point is the surprising fact that we even work on Sundays.

Yes, in a normal full sentence, Danish needs the subject:

• Vi arbejder endda om søndagen

Unlike in some languages, you generally do not drop the subject pronoun in ordinary statements.

So you cannot normally just say:

• Arbejder endda om søndagen

unless it is in a very special context, like a headline, note, or highly informal speech.

It normally expresses a general habit.

The clue is om søndagen, which refers to Sundays in general. So the sentence means that working on Sundays is part of the routine.

If you wanted to talk about right now, Danish would usually need more context, for example:

• Vi arbejder lige nu = We are working right now

But as written, your sentence is understood as habitual:

• We even work on Sundays

Yes, it adds noticeable emphasis.

It suggests something like:

• surprisingly
• to such an extent that
• even

So the speaker is not just stating a fact. They are implying that Sunday work is an extra or unexpected burden.

Depending on tone, it can sound:

• surprised
• impressed
• annoyed
• complaining

So endda often carries an emotional or rhetorical effect, not just plain information.