know for a fact

idiom
Updated on: 15 Nov 2017

Definition of know for a fact

: to be certain
  • I know for a fact that he did it.

Word by Word Definitions

know play
  1. : to perceive directly : have direct cognition of

  2. : to have understanding of

  3. : to recognize the nature of : discern

  1. : knowledge

fact play
  1. : something that has actual existence

  2. : an actual occurrence

  3. : a piece of information presented as having objective reality


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