call in vs swap out

call in

verb
  • To withdraw something from sale or circulation. 

  • To communicate with a base etc, by telephone. 

  • To pay a short visit. 

  • To summon someone, especially for help or advice. 

  • To report; communicate (a message) by telephone or similar. 

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