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to make a pass
Means to make an amorous advance. People have been "making passes at each other" since at least 1928, which was when this phrase was first recorded. It probably has a sporting origin.
Typical usage:
"Nowadays, making a pass at a member of staff can lose you your job."
Synonyms:
chat up, come hither, come on, coquet, eyeball, flirt, gold dig, hit on, lead on, linger with, monkey with, ogle, philander, pick up, pitch, play, proposition, tease, toy, trifle, vamp, wink at, wolf-whistle