(intransitive) To assume a sitting position from a position lying down. / (intransitive) To sit erect. / (intransitive) To show sudden interest or surprise.

Alternative spelling of sit-up

Honest; honorable. / Upright; while standing. / Performed while standing although normally done while sitting.

(uncountable) A performance of stand-up comedy; jokes delivered standing on a stage / (countable) A comedian who performs on stage.

(colloquial, in rhetorical questions or salutations) What's wrong with; what's the problem or matter with. Said to express that the behaviour of someone, or operation of something, is out of the ordinary or problematic.

To give in. / To clear away and place into storage. / To put back together. / To move one's residence. / To prepare for shipping, as a gift. / (of things) To put into bags to prepare to move.

Used other than figuratively or idiomatically: see throw, up. / (now colloquial) To vomit. / To produce something new or unexpected. / To cause something such as dust or water to rise into the air.

(colloquial) Vomit.

(idiomatic, colloquial, with up in the sense of "of concern") What’s the matter? What is the problem? What is wrong?

(transitive, figuratively, informal) To flatter, especially with the intent of personal gain.