knuckle down

verb

Definition of knuckle down

  1. intransitive verb
  2. :  to apply oneself earnestly

Circa 1864

First Known Use of knuckle down

circa 1864


Seen and Heard

What made you want to look up knuckle down? 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!

WORD OF THE DAY

a dividing ridge between drainage areas

Get Word of the Day daily email!

Love words? Need even more definitions?

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