maintain vs send off

maintain

verb
  • To declare or affirm (a clause) to be true; to assert. 

  • To keep up; to preserve; to uphold (a state, condition etc.). 

send off

verb
  • To show someone a red card, and dismiss them from the playing area. 

  • To provide a celebration for someone who is leaving; give a sendoff. 

  • To send; to dispatch. 

  • To emit; to emanate. 

noun
  • farewell party 

  • funeral or memorial service 

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