know one's stuff

idiom
Updated on: 15 Nov 2017

Definition of know one's stuff

informal
:to be an expert at something
  • When it comes to gardening, she really knows her stuff.

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

stuff play
  1. : materials, supplies, or equipment used in various activities: such as

  2. : military baggage

  3. : personal property

  1. : to fill by packing things in : cram

  2. : to fill to satiety : surfeit

  3. : to prepare (meat or vegetables) by filling or lining with a stuffing


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