wasn't born yesterday
idiom
—used to say that someone is unlikely to believe something that is not true or to trust someone who is not trustworthy
He 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 19 Apr. 2024.
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