you/you'd better believe it
idiom
—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!"
Cite this Entry
“You/you'd better believe it.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/you%2Fyou%27d%20better%20believe%20it. Accessed 31 Jul. 2025.
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Merriam-Webster unabridged
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