- to apply oneself vigorously and earnestly; become serious: Just knuckle down for an hour or so and finish the work.
- Also knuckle under. to submit; yield.
Origin of knuckle
OTHER WORDS FROM knuckleknuckly, adjective
How to use knuckle in a sentence
The soldier launches into a comical strut and pretends to polish his guard box with his knuckles.Hunt To Identify Pirouetting 'Bearskin' Guardsman Who Shamed Army|Tom Sykes|September 3, 2014|DAILY BEAST
Ray seemed to understand immediately and said “Yeah,” offering his knuckles.
Craig Dershowitz spent $60,000 fighting for the return of his dog Knuckles after an acrimonious breakup with his girlfriend.
Subject has athletic build, calloused knuckles, broken nose – characteristics of martial arts practitioners.Russia Tells ‘Tourists’ How to Go Fight in Ukraine|Oleg Shynkarenko|April 13, 2014|DAILY BEAST
He turned the page and ran his fingerless knuckles down the closely-written columns.Read ‘The King in Yellow,’ the ‘True Detective’ Reference That’s the Key to the Show|Robert W. Chambers|February 20, 2014|DAILY BEAST
Mademoiselle snatched it from the hand, which was very tiny, and pink, with dimples where grown up folk have knuckles.Rosemary in Search of a Father|C. N. Williamson
Aristide, however, went up to the door; as there was neither knocker nor bell, he rapped with his knuckles.The Joyous Adventures of Aristide Pujol|William J. Locke
Marius, without further heeding him, stepped to mademoiselle's door and rapped on a panel with brisk knuckles.
She shrank back, her hands locking themselves one in the other till the knuckles showed white.
Mike could push his knuckles hard into the faces of people who owed him money, and he'd never even be arrested.The Man from Time|Frank Belknap Long
British Dictionary definitions for knuckle
Derived forms of knuckleknuckly, adjective
Word Origin for knuckle
Medical definitions for knuckle
Other Idioms and Phrases with knuckle
In addition to the idioms beginning with knuckle
- knuckle down
- knuckle under
- rap someone's knuckles