knuckle

1. Any of the joints between the bones of the fingers.

   Fingerknöchel

   суста́в па́льцаsustáv pálʹca

2. (broadly)A mechanical joint.

   a joint of a finger when the fist is closed

3. The curved part of the cushion at the entrance to the pockets on a cue sports table.

4. The kneejoint of a quadruped, especially of a calf; formerly, the kneejoint of a human being.

5. A cut of meat of various kinds.

   Beef knuckle is from the knee joint. Pork knuckle, or ham hock, is from the joint between the tibia/fibula and the metatarsals of the foot of a pig, where the foot was attached to the leg.

6. A convex portion of a vessel's figure where a sudden change of shape occurs, as in a canal boat, where a nearly vertical side joins a nearly flat bottom.

7. A contrivance, usually of brass or iron, and furnished with points, worn to protect the hand, to add force to a blow, and to disfigure the person struck; a knuckle duster.

   brass knuckles

8. The rounded point where a flat changes to a slope on a piste.

9. (obsolete)The joint of a plant.

1. You'd better knuckle down to work.

   ruЛучше тебе приступить к работе. — RusVictoric1993

   deMach dich besser an die Arbeit. — Roujin

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2. I heard Tom cracking his knuckles.

   ruЯ слышал, как Том хрустит костяшками. — Karok

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3. Tom says he heard Mary cracking her knuckles.

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4. Tom doesn't like it when Mary cracks her knuckles.

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5. Tom skinned his knuckles.

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