The phrase "gives the come on" usually means to flirt or signal romantic interest towards someone. Some antonyms for this phrase might include "ignores," "avoids," "rejects," or "repels." Conversely, other antonyms for "gives the come on" might describe actions that are not necessarily romantic or flirty, such as "disinterests," "disgusts," or "bores." In any case, using an antonym for "gives the come on" might be a way to describe a situation where there is no romantic interest or attraction between two people, or even to indicate a negative reaction to someone's advances.