you/you'd better believe it

idiom

Definition of you/you'd better believe it 

used to indicate that the speaker emphatically agrees with a statement or sentiment "Do you think they can win?" "You/You'd better believe it!"

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you won't believe

you wouldn't believe

you would swear

you/you'd better believe it

yow

yowl

yowt

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exaggeratedly or childishly emotional

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