clam up Meaning in the Cambridge Learner’s Dictionary
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Meaning of “clam up” - Learner’s Dictionary

clam up

informal phrasal verb with clam
 
 
/klæm/ verb ( present participle clamming, past tense and past participle clammed)
to suddenly stop talking, usually because you are embarrassed or nervous: He was afraid he would clam up in front of the television camera.Falling silent and not speaking
(Definition of clam up from the Cambridge Learner’s Dictionary © Cambridge University Press)
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