give someone the once-over

give (one) the once-over

1. To inspect or examine one quickly. Make sure you give everyone the once-over before they come into the club. We don't want anyone bringing in anything dangerous. Let me give you the once-over to make sure your outfit looks all right.
2. To look at one in a way that conveys interest, often sexual interest. That cute guy is definitely giving you the once-over—you should go talk to him!
See also: give
Farlex Dictionary of Idioms.

give someone the once-over

Also, give someone the eye. Look or stare at someone with interest. For example, The new coach gave the team the once-over before introducing himself, or He gave her the eye and she blushed. The first expression, a colloquialism, generally implies a quick but comprehensive survey or assessment. The variant, a slangy usage sometimes amplified to give the glad eye, often signifies an inviting glance. [Early 1900s] Also see make eyes at.
See also: give, someone
The American Heritage® Dictionary of Idioms by Christine Ammer.
See also:
  • give (one) the once-over
  • give somebody/something a/the once-over
  • give someone/something the once-over
  • give something a once-over
  • give (something) a once-over
  • once-over
  • run the rule over
  • run the rule over (one)
  • check through
  • give (someone/something) the once-over, to