Definition of clam up Clam up

We found 2 definitions of clam up from 2 different sources.

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What does clam up mean?

WordNet

WordNet by Princeton University

Verb

clam up - refuse to talk or stop talking; fall silent; "The children shut up when their father approached"
  close up, dummy up, shut up, belt up, button up, be quiet, keep mum
  open up talk freely and without inhibition
= synonym
= antonym
= related word

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Pronunciation

Sign Language

clam up in sign language
Sign language - letter C Sign language - letter C Sign language - letter L Sign language - letter L Sign language - letter A Sign language - letter A Sign language - letter M Sign language - letter M        Sign language - letter U Sign language - letter U Sign language - letter P Sign language - letter P

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