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English definition of “come on”

come on

(LACK BELIEF) (not standard c'mon) phrasal verb with come    /kʌm/ verb (past tense came  /keɪm/, past participle come)
used for telling someone you do not believe what the person is saying or you think the person is not being serious : Oh, come on. You have no evidence whatsoever .
(Definition of come on (LACK BELIEF) from the Cambridge Academic Content Dictionary © Cambridge University Press)
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