What it means
To knuckle down means to stop messing about and properly get on with it. You use it when someone quits the excuses, puts their head in gear, and gives a job real focus and effort. It can be about studying, work, sorting your life out, whatever needs proper application.
Usage examples
"If you knuckle down for these last two weeks of revision, you will walk into that exam feeling ready."
"Exams are next week, time to knuckle down and stop messing about."
"You can still pull this project back if you knuckle down and quit doom-scrolling for one night."
"He finally knuckled down after Christmas and smashed through all the coursework he'd been ducking."
"Right, I've had my little sulk now. Time to knuckle down and finish this essay before midnight."
Where it comes from
It comes from marbles. In that game, putting your knuckle to the ground was the proper position for taking a serious shot, called knuckling down. That idea of physically settling in and doing it right drifted into everyday English, where it came to mean applying yourself properly and getting stuck in.
Other ways to say it
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