not so fast

idiom

Definition of not so fast

informal
used in speech to say that one disagrees with what someone has said or to tell someone to stop or slow down"This proves they're wrong." "Not so fast. There's other evidence to consider.""The discussion is closed." "Not so fast. I have a few more things to say."

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“Not so fast.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/not%20so%20fast. Accessed 31 Oct. 2020.

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