cash in vs swap out

cash in

verb
  • To exchange for cash. 

  • To die. 

  • To profit from something; to take advantage of an opportunity in order to profit, especially financially. 

swap out

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

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

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

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 cash in and swap out occurred in a corpus of books? (source: Google Ngram Viewer )