one (can) bet one's ass
idiom
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!"
Cite this Entry
“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 Nov. 2025.
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Merriam-Webster unabridged
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