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English definition of “come on”

come on

verb phrasal verb with come  /kʌm/ (past tense came  /keɪm/, past participle come) us  

(START TO DEVELOP)

to start to develop gradually, as an illness or a mood: He felt one of his headaches coming on.
(Definition of come on phrasal verb, verb from the Cambridge Academic Content Dictionary © Cambridge University Press)
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