Ian kneed him in the groin.

伊恩用膝盖撞击他的腹股沟。

He kneed his attacker in the groin.

他用膝盖猛撞攻击者的下身。

He would need all his authority to keep the weak-kneed volunteers from bolting.

他需要动用所有的职权以防止这些胆小的志愿兵逃跑。

He's just a weak-kneed coward.

他只是一个别容易屈服的懦夫。

You kneed me in my misters!

你顶住我的小先生了！