contend vs give in

contend

verb
  • To be in opposition; to contest; to dispute; to vie; to quarrel; to fight. 

  • To be in debate; to engage in discussion; to dispute; to argue. 

  • To believe (something is reasonable) and argue (for it); to advocate. 

  • To struggle or exert oneself to obtain or retain possession of, or to defend. 

  • contend with: To try to cope with a difficulty or problem. 

give in

verb
  • to relent, yield, surrender or admit defeat 

  • to droop the head 

  • to collapse or fall 

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