not know one's arse from one's elbow

idiom
Updated on: 15 Nov 2017

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

British, informal + impolite
: to know nothing : to be stupid
  • Don't take his word for it—he doesn't know his arse 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


Seen and Heard

What made you want to look up not know one's arse from one's elbow? Please tell us where you read or heard it (including the quote, if possible).

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!