clam up

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verb

Definition of CLAM UP

to stop talking <the little girl clammed up when the doctor came into the room>

Synonyms belt up [British], clam up, dry up, dummy up, hush, pipe down, quiet (down)

Related Words calm (down), cool (down), settle (down); haw, hem

Near Antonyms pipe up, sound off, speak out, speak up, spout (off), talk up

Antonyms speak, talk