put aside vs slip off

put aside

verb
  • To ignore or intentionally disregard (something), temporarily or permanently, so that more important things can occupy one's attention. 

  • Used other than figuratively or idiomatically: see put, aside. 

  • To save or keep (something) to be used at a later time. 

slip off

verb
  • To leave a place, or a meeting, without being noticed 

  • To leave a port, anchorage or mooring 

  • To remove an article of clothing 

How often have the words put aside and slip off occurred in a corpus of books? (source: Google Ngram Viewer )