wasn't born yesterday

idiom

Definition of wasn't born yesterday

used to say that someone is unlikely to believe something that is not true or to trust someone who is not trustworthyHe said he'd pay me back, but I'll believe it when I see it. I wasn't born yesterday.

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“Wasn't born yesterday.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/wasn%27t%20born%20yesterday. Accessed 26 Sep. 2020.

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