From Wiktionary, the free dictionary
holde op (imperative hold op, infinitive at holde op, present tense holder op, past tense holdt op, perfect tense er holdt op)
- (intransitive) stop (doing something)
Hold nu op med det der!- Would you stop that!
Barnet holdt ikke op med at græde.- The child didn't stop crying.
Jeg er holdt op med at ryge.- I have stopped smoking.