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1. To stop speaking or be silent. Would you shut up already? I'm sick of hearing you complain. I decided to shut up before I made things any worse.
2. To cause or compel someone to stop speaking or be silent. The mobsters threatened the witness to try and shut him up. The exasperated parent was trying to find some way of shutting the kids up.
3. To imprison or lock someone into some place; to confine someone. They shut the criminal up in a tiny windowless cell as punishment for attacking another inmate. I feel so trapped, shut up in the house all day.
Inf. Be quiet! (Impolite.) Bob: And another thing. Bill: Oh, shut up, Bob! Andy: Shut up! I've heard enough! Bob: But I have more to say! "Shut up! I can't hear anything because of all your noise!" shouted the director.
See also: shut