knuckle

n. 指节, 蹄爪, 膝关节
vt. 以指节打, 以手指射
vi. 以指节打, 以手指射
【化】 过渡圆角
【医】 指节, 膨出部
相关词组:
near the knuckle

动词过去式:knuckled 过去分词:knuckled 现在分词:knuckling 第三人称单数:knuckles 

knuck.le

n.（名词）
Anatomy
【解剖学】
The prominence of the dorsal aspect of a joint of a finger, especially of one of the joints connecting the fingers to the hand.
指关节：手指关节的背面突起，特别是连结手指与手掌的那个突起
A rounded protuberance formed by the bones in a joint.
（屈指时）指节膨出部：关节中由骨头形成的圆形突出物
A cut of meat centering on the carpal or tarsal joint, as of a pig.
肘子：以腕关节或肘关节为中心切下来的肉，比如说猪肉
The part of a hinge through which the pin passes.
铰链连接：铰链中关节销穿过去的那个地方
knuckles Brass knuckles.
knuckles 指节铜套
v.tr.（及物动词）
knuck.led,knuck.ling,knuck.les
To press, rub, or hit with the knuckles.
用指关节压、摩擦或叩击
Games To shoot (a marble) with the thumb over the bent forefinger.
【游戏】 弹玻璃弹子：拇指在弯曲的食指上方射出（弹子）

<常用词组>knuckle down
To apply oneself earnestly to a task.
认真地投入工作
knuckle under
To yield to pressure; give in.
向外界压力作出让步；屈服
来源：
Middle English knokel
中古英语 knokel