bend the knee to sb.

1. 向某人下跪；屈服於某人
   You cannot expect a prince to bend the knee to an ordinary man.

   你不能指望王子會向平民屈膝。

bring sb. to his knees

1. 迫使某人屈服
   They tried to bring him to his knees.

   他們試圖迫使他屈服。

• at one's mother's (or father's) knee
  at an early age.
• bend (or bow) the (or one's) knee
  submit.
• bring someone (or something) to their (or its) knees
  reduce someone or something to a state of weakness or submission.
• on bended knee (s)
  kneeling.