knuckling
['nʌklɪŋ]
n.
突球;
v.
（指人）指关节( knuckle的现在分词 );
（指动物）膝关节，踝;
例句:
-
It's all about knuckling down and batting well for England now.
来自BBC
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Taking collective responsibility for social problems is not the same thing as knuckling under to a tyrannical government.
来自WSJ