This is the 24th most frequent Norwegian word.
opp
"Opp" means "up" in English.
In this sentence, 'opp' is used to indicate the action of rising or getting out of bed.
Jeg må stå opp tidlig i morgen.
I have to get up early tomorrow.
Here, 'opp' conveys the upward motion of lifting something.
Barnet tok opp lekene fra gulvet.
The child picked up the toys from the floor.
In this usage, 'opp' is part of an idiomatic expression meaning to create or invent.