go down vs swap out

go down

verb
  • To be received or accepted. 

  • To crash. 

  • To be soundly defeated. 

  • Used other than figuratively or idiomatically: see go, down. 

  • To be pleasant, etc., when eaten or drunk. 

  • To perform oral sex. 

  • To decrease; to change from a greater value to a lesser one. 

  • To fall (down); to fall to the floor. 

  • To take place, happen. 

  • To sink. 

  • To be blamed for something; to be the scapegoat; to go to prison. 

  • To stop functioning, to go offline. 

  • To be recorded or remembered (as). 

  • Synonym of set, to disappear below the horizon. 

swap out

verb
  • To exchange (something) for (something else). (usually followed by with or for) 

  • To transfer (memory contents) into a swap file. 

  • To exchange (something or someone) for an unused (or less-used) equivalent. 

noun
  • Anything that is swapped out for another; an exchange. 

  • A pre-prepared food item used in place of an unfinished food item in order to cut down the overall preparation time during filming. 

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