you wouldn't believe

idiom

—used to suggest that the listener will be surprised
You wouldn't believe how long it took us to get here.

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you won't believe
you wouldn't believe
you would swear
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“You wouldn't believe.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/you%20wouldn%27t%20believe. Accessed 5 Jul. 2025.

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