a comic performer, as in a circus, theatrical production, or the like, who wears an outlandish costume and makeup and entertains by pantomiming common situations or actions in exaggerated or ridiculous fashion, by juggling or tumbling, etc.
2.
a person who acts like a clown; comedian; joker; buffoon; jester.
1560s, origin uncertain. Perhaps from Scand. dial., or akin to N.Fris. klonne "clumsy person," or, less likely, from L. colonus "colonist, farmer," hence, "rustic, boor," which apparently was the earliest Eng. sense.
n. a fool. : Tell that clown in the front row to shut up.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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