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Definition of Clam up
1. Verb. Refuse to talk or stop talking; fall silent. "The children shut up when their father approached"
Exact synonyms: Be Quiet, Belt Up, Button Up, Close Up, Dummy Up, Keep Mum, Shut Up
Antonyms: Open Up
Antonyms: Open Up
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1. Verb. Refuse to talk or stop talking; fall silent. "The children shut up when their father approached"