hold onto vs set aside

hold onto

verb
  • To manage to keep something. 

  • Used other than figuratively or idiomatically: see hold, onto. 

set aside

verb
  • To separate and reserve something for a specific purpose. 

  • To disagree with something and reject or overturn it. 

  • To declare something invalid or null and void. 

  • To leave out of account; to omit or neglect. 

How often have the words hold onto and set aside occurred in a corpus of books? (source: Google Ngram Viewer )