clam up

verb

Definition of clam up 

intransitive verb

: to become silent clammed up and refused to talk

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Synonyms & Antonyms for clam up

Synonyms

hush, pipe down, quiet (down), shut up

Antonyms

speak, talk

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Examples of clam up in a Sentence

the little girl clammed up when the doctor came into the room

First Known Use of clam up

1916, in the meaning defined above

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Time Traveler for clam up

The first known use of clam up was in 1916

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