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English definition of “can't”

can't

    /kɑːnt/ US  /kænt/
short form of cannot: Speak up! I can't hear you. often used to suggest that someone should do a particular thing, especially when it seems the obvious thing to do: Can't you just take the dress back to the shop if it doesn't fit?
(Definition of can't from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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