bring on vs level out

bring on

verb
  • To cause. 

  • To pose a challenge or threat; to attack; to compete aggressively. 

  • To make something appear, as on a stage or a place of competition. 

level out

verb
  • To cause (something) to be even. 

  • To become even. 

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