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

clam

noun
 
/klæm/
 
/klæm/
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  1. 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).
    Topics Fish and shellfishc2
    Word Originearly 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 clam in the Oxford Advanced American Dictionary
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