Definitions for clam up
This page provides all possible meanings and translations of the word clam up
close up, clam up, dummy up, shut up, belt up, button up, be quiet, keep mum(verb)
refuse to talk or stop talking; fall silent
"The children shut up when their father approached"
To become silent; to stop talking, to shut up.
Origin: By analogy with a clam closing itself.
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