not know one's ass from one's elbowidiom
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.
Love words? Need even more definitions?Merriam-Webster unabridged
Words at Play
- The Good, The Bad, & The Semantically Imprecise - 11/15/19
- 'Cliché': We’ve Heard It All Before
- 'Bounty Hunter': A Hollywood Invention
- Casting Light on 'Angel'
Ask the Editors
- Pass the Little Ribbons: A Pasta Word Quiz Take the quiz
- Confusing Words—A Quiz Take the quiz
- Spell It Take the quiz
- Syn City Play the game