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]
|a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.|
|a gadget; dingus; thingumbob.|
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