come on phrasal verb, verb Meaning in Cambridge American English Dictionary
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Meaning of "come on" - American English Dictionary

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come on

(not standard c'mon)
phrasal verb with come  us   /kʌm/ verb (past tense came  /keɪm/ , past participle come)

(LACK BELIEF)

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 phrasal verb, verb from the Cambridge Academic Content Dictionary © Cambridge University Press)
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