tv. to get all of someone's money. (See also cleaned out.) : The bill for supper cleaned me out, and we couldn't go to the flick.
tv. to empty someone's bowels. (See also cleaned out.) : That medicine I took really cleaned me out.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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American Heritage
Idioms & Phrases
come clean
Confess everything, as in If you come clean about what happened I will promise to keep it to myself. [Slang; early 1900s]