Definition of come on
1 a : to advance by degrees <darkness came on> b : to begin by degrees <rain came on toward noon>
2 a : please —used in cajoling or pleading b —used interjectionally to express astonishment, incredulity, or recognition of a put-on
3 : to project an indicated personal image <comes on as a conservative>
4 : to show sexual interest in someone; also : to make sexual advances —usually used with to <tried to come on to her>
First Known Use of come on
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