What is Once-over?
1.
(n) a sweeping glance down and up the body of an attractive person
(v) "to give one the once-over." to check out someone you find attractive by quickly looking them down and up, usually from a distance, head to toe. can be done discreetly or more obviously, by smiling or raising the eyebrows upon giving the subject of one's interest the once-over.
"just give him the old once-over, he'll know you're interested."
"i saw you giving her the once-over. don't you think she's cute?"
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