not so fast

idiom
Updated on: 15 Nov 2017

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."

Word by Word Definitions

fast play
  1. : firmly fixed

  2. : tightly shut

  3. : adhering firmly

  1. : in a firm or fixed manner

  2. : in a sound manner : deeply

  3. : in a rapid manner : quickly

  1. : to abstain from food

  2. : to eat sparingly or abstain from some foods

  1. : the practice of fasting

  2. : a time of fasting

  1. : something that fastens (such as a mooring line) or holds a fastening


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