backtaxi vs revise

backtaxi

verb
  • Synonym of backtrack 

noun
  • Synonym of backtrack 

revise

verb
  • To look over again (something previously written or learned), especially in preparation for an examination. 

  • To review, alter and amend, especially of written material. 

noun
  • A second proof sheet; a proof sheet taken after the first or a subsequent correction. 

  • A review or a revision. 

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