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Clam up
verb, slang
Definitions
Verb
- 1 To become silent; to stop talking. informal, intransitive
"Maybe he … or she … was a witness who refused to clam up … a whistle blower …"
- 2 refuse to talk or stop talking; fall silent wordnet
- 3 To make or become clammy. ambitransitive
Etymology
By analogy with a clam closing itself. Compare clamshell (“mouth”), clam (“mouth”).
See also for "clam up"
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Unscramble this word: clamup