boot out vs expel

boot out

verb
  • Emphatic synonym of kick out: to remove, to eject, to expel. 

  • To fall or slide out of a turn due to excessive lean, which causes the athlete's boot to contact and pivot on the surface and the proper surface contact element to lose contact and traction. 

expel

verb
  • To eject or erupt. 

  • To remove from membership. 

  • To deport. 

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