you'd better believe it

Idioms & Phrases

you'd better believe it

Also, you better believe it. You may be assured, as in You walk ten miles every day?You'd better believe it! This imperative is almost synonymous with you bet your ass. [Colloquial; mid-1800s]

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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