one (can) bet one's ass

idiom

Definition of one (can) bet one's ass

chiefly US, informal + impolite
: one can be very certain "Are you sure you're going to win?" "You (can) bet your ass I'm going to win!"

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“One (can) bet one's ass.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/one%20%28can%29%20bet%20one%27s%20ass. Accessed 4 Dec. 2020.

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