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]

Common Names:

Name	Pronounced	Usage
Jill	JIL	English
Norma	['nɔ:mə]
Freyr	FRAYR	Norse Mythology, Icelandic
Reeves	[ri:vz]
Harri	HAHR-ree (Finnish)	Finnish, Welsh
Sauli	SOW-lee	Finnish