knuckle
[ˈnʌkəl]
n.
（指人）指关节;
（指动物）膝关节，肘;
铰结，肘形接;
铜指节套;
vt.
用指关节打、压、碰、擦;
例句:
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Incautious because Today listeners love a bare-knuckle word fight.
来自BBC
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When Heather returns, we can really knuckle down.
来自BBC
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David Seaman was back in the Arsenal goal after breaking a knuckle.
戴维·西曼在一个指关节骨折后又回到阿森纳队的球门前。
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It is arguable whether the rebels will knuckle under.
还不能确定反叛者是否会投降。
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The United States, he said, did not knuckle under to demands.
他说，美国不会屈从于他人的要求。
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I stuck in my forefinger up to the knuckle.
来自S. Beckett