use your loaf

use (one's) loaf

slang To think logically, rationally, or with common sense; to use one's head. The phrase comes from rhyming slang in which "loaf" is short for "loaf of bread," which rhymes with "head." Primarily heard in UK, Australia. Come on, Dean, I know you can figure this out on your own. Use your loaf! Jenny finally remembered to bring the right books home to do her homework. I'm glad she's finally using her loaf.
See also: loaf, use
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

use your loaf

use your common sense. British informal
This expression probably comes from loaf of bread , rhyming slang for ‘head’.
See also: loaf, use
Farlex Partner Idioms Dictionary © Farlex 2017
See also:
References in periodicals archive ?
And how often have we been told to "use your loaf"?
USE YOUR LOAF: Big Issue vendor John with his bread Picture: COLIN LANE
Campbell Williams, the legal expert attempting to refresh us, said that a good rule of thumb was to "use your loaf".