Как по Английски будет костяшки пальцев

noun

A slow pitch which moves erratically, made by releasing the ball from the knuckles of the first joints of the index and middle finger.

Примеры использования:

He had pitched in high school and occasionally had thrown a knuckleball.

verb

Rub or press (something, especially the eyes) with the knuckles.

Примеры использования:

Cora followed suit, knuckling the small of her back and grateful to be off her feet.

noun

A part of a finger at a joint where the bone is near the surface, especially where the finger joins the hand.

Примеры использования:

Brian rubbed his thumb back and forth over my index finger knuckle, tickling me a little bit.

phrasal verb

To start working hard

Примеры использования:

You’re going to have to knuckle down and catch up on your schoolwork.