clam up Meaning in the Cambridge English Dictionary
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Meaning of “clam up” in the English Dictionary

"clam up" in British English

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clam up

(also shut up like a clam) informal
phrasal verb with clam uk   us   /klæm/ verb (-mm-)
to ​becomesilentsuddenly, usually because you are ​embarrassed or ​nervous, or do not ​want to ​talk about a ​particularsubject: He just ​clams up if you ​ask him about his ​childhood.
(Definition of clam up from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"clam up" in American English

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clam up

 /ˈklæm ˈʌp/ (-mm-) infml
phrasal verb with clam verb
to ​refuse to ​talk or ​answer: He just clammed up when I ​walked in.
(Definition of clam up from the Cambridge Academic Content Dictionary © Cambridge University Press)
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