knuckle

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Related to knuckled down: out of whack, buckle down

knuckle

1. a joint of a finger, esp that connecting a finger to the hand
2. the cylindrical portion of a hinge through which the pin passes
3. an angle joint between two members of a structure

Knuckle

The part of a hinge containing the holes through which the pin passes.

knuckle

[′nək·əl]
(mining engineering)
The place on an incline where there is a sudden change in grade.

knuckle

One of the cylindrically projecting parts of a hinge through which the pin passes.
References in periodicals archive ?
We knew he was a talented lad but he has also knuckled down.
There were a number of outstanding performances today,but it was pleasing to see the way the lads knuckled down.
Take an insider's tribute to her "brave" return to work: "Ever the professional she just knuckled down.
GOLF: American Anthony Kim enjoyed a world-class Ryder Cup celebration, but he knuckled down to open a four-stroke lead after the opening round at the lucrative Tour Championship.
It isn't always easy getting back to your best after so long out but contrary to some wayward reports, I hear he has knuckled down and been anything but unsettled or unhappy within the camp.
But he knuckled down and showed a great determination and get what was required of a Premier League player.
However, Septimus should be given plenty of credit for the way he knuckled down under pressure, this once-raced maiden winnershowing his inexperience before running on stoutly into a strong headwind.