bend the knee vs submit

bend the knee

verb
  • To submit to another's authority. 

submit

verb
  • To enter or put forward for approval, consideration, marking etc. 

  • To yield (something) to another, as when defeated. 

  • To win a fight against (an opponent) by submission. 

  • To yield or give way to another. 

  • To subject; to put through a process. 

How often have the words bend the knee and submit occurred in a corpus of books? (source: Google Ngram Viewer )