bet one's ass

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you bet your ass

rude slang Absolutely. You bet your ass I'll be there on Friday!
See also: ass, bet
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

bet one's ass

Also, bet one's boots or bottom dollar or life . See you bet your ass.
See also: ass, bet
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.