adjective

1. standing upright or erect
2. done, taken, etc. in a standing position a stand-up lunch
3. high, stiff, and without folds: said of a collar
4. ☆ designating or of a comedian who delivers monologues, tells a series of jokes, etc., as in nightclubs
5. Slang designating or having to do with a loyal, courageous person who will stand up resolutely for friends, principles, etc. a stand-up guy