chuck out vs retain

chuck out

verb
  • To discard, to dispose of (something). 

  • ; To drive out; to turn out (somebody). 

retain

verb
  • To keep in possession or use. 

  • To employ by paying a retainer. 

  • To hold back (a pupil) instead of allowing them to advance to the next class or year. 

  • To keep in one's pay or service. 

  • To hold secure. 

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