expel vs wash down

expel

verb
  • To eject or erupt. 

  • To remove from membership. 

  • To deport. 

wash down

verb
  • To wash something completely from top to bottom. 

  • To help to swallow by drinking a liquid, after eating something, or taking a pill. 

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