choose vs sift out

choose

verb
  • To pick; to make the choice of; to select. 

  • To elect. 

  • To prefer; to wish; to desire. 

  • To decide to act in a certain way. 

conj
  • The binomial coefficient of the previous and following number. 

sift out

verb
  • To isolate or identify one particular thing from a collection that includes less relevant things. 

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