not know one's ass from one's elbow

idiom
Updated on: 15 Nov 2017

Definition of not know one's ass from one's elbow

chiefly US, informal + impolite
: to know nothing : to be stupid
  • Don't take his word for it—he doesn't know his ass from his elbow.

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

elbow play
  1. : the joint of the human arm

  2. : a corresponding joint in the anterior limb of a lower vertebrate

  3. : something (such as macaroni or an angular pipe fitting) resembling an elbow

  1. : to push with the elbow : jostle

  2. : to shove aside by pushing with or as if with the elbow

  3. : to force (one's way) by pushing with or as if with the elbow


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