fend off vs submit

fend off

verb
  • To defend against; to repel with force or effort 

  • To prevent (a vessel) from running against anything with too much violence. 

submit

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

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

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

  • To yield or give way to another. 

  • To subject; to put through a process. 

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