knuckle

詳細解釋：

knuck.le

n.（名詞）
Anatomy
【解剖學】
The prominence of the dorsal aspect of a joint of a finger, especially of one of the joints connecting the fingers to the hand.
指關節：手指關節的背面突起，特別是連結手指與手掌的那個突起
A rounded protuberance formed by the bones in a joint.
（屈指時）指節膨出部：關節中由骨頭形成的圓形突出物
A cut of meat centering on the carpal or tarsal joint, as of a pig.
肘子：以腕關節或肘關節為中心切下來的肉，比如說豬肉
The part of a hinge through which the pin passes.
鉸鏈連線：鉸鏈中關節銷穿過去的那個地方
knuckles Brass knuckles.
knuckles 指節銅套
v.tr.（及物動詞）
knuck.led,knuck.ling,knuck.les
To press, rub, or hit with the knuckles.
用指關節壓、摩擦或叩擊
Games To shoot (a marble) with the thumb over the bent forefinger.
【遊戲】 彈玻璃彈子：拇指在彎曲的食指上方射出（彈子）

<常用詞組>knuckle down
To apply oneself earnestly to a task.
認真地投入工作
knuckle under
To yield to pressure; give in.
向外界壓力作出讓步；屈服
來源：
Middle English knokel
中古英文 knokel