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come on

(START) phrasal verb with come
 
 
/kʌm/ verb (came, come)

Definition

C1 to start to happen or work: The heating comes on at six in the morning.Starting and beginningStarting again If you have got an illness coming on, it is starting gradually: I think I've got a cold coming on.Starting and beginningStarting again UK informal If a woman comes on, her period (= the blood coming from the womb that happens every month) starts.Processes and stages connected with sexual reproduction
(Definition of come on (START) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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