brave out vs persist

brave out

verb
  • To tolerate or put up with bravely 

persist

verb
  • To go on stubbornly or resolutely. 

  • To repeat an utterance. 

  • To cause to persist; make permanent. 

  • To continue to exist. 

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