Definition of clam noun from the Oxford Advanced Learner's Dictionary

 

clam

 noun
noun
BrE BrE//klæm//
 
; NAmE NAmE//klæm//
 
Invertebrates
 
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a shellfish that can be eaten. It has a shell in two parts that can open and close. clam chowder/soup The moment I mentioned the children he closed up like a clam (= became silent and refused to discuss the topic). See related entries: Invertebrates Word Origin early 16th cent.: apparently from earlier clam ‘a clamp’, from Old English clam, clamm ‘a bond or bondage’, of Germanic origin; related to Dutch klemme, German Klemme, also to clamp.
See the Oxford Advanced American Dictionary entry: clam

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