account for vs plateau

account for

verb
  • To constitute in amount or portion. 

  • To destroy or put out of action. 

  • To make or render a reckoning of funds, persons, or things. 

  • To be answerable for. 

  • To be the primary cause of 

  • To explain by relating circumstances; to show that some one, thing or members of a group are present or have been processed. 

plateau

verb
  • (of a varying quantity) To reach a stable level after a period of increase; to level off. 

noun
  • A comparatively stable level after a period of increase. 

  • A notable level of attainment or achievement. 

  • A largely level expanse of land at a high elevation; tableland. 

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