not know one's arse from one's elbow

idiom

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.

Learn More about not know one's arse from one's elbow

Dictionary Entries near not know one's arse from one's elbow

not just a/another pretty face

not just/only/merely

not know beans about

not know one's arse from one's elbow

not know one's ass from one's elbow

not know one's own strength

not know someone from Adam

Statistics for not know one's arse from one's elbow

Look-up Popularity

Comments on not know one's arse from one's elbow

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).

WORD OF THE DAY

rebuff

to reject or criticize sharply

Test Your Vocabulary

Words from Greek and Roman Mythology Quiz

Boreal comes from the name of the ancient Greek god of which wind?

How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!

TAKE THE QUIZ

SCRABBLE® Sprint

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ

Words at Play

Ask the Editors

Word Games