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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.

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The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.