air out vs propound

air out

verb
  • To discuss in the open; to address an issue or conflict that has long been avoided. 

  • To throw passes, especially long and high passes. 

  • To expose to air; to leave open or spread out, as to allow odor or moisture to dissipate. 

propound

verb
  • To put forward; to offer for discussion or debate. 

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