check in vs leave

check in

verb
  • To send somebody to solitary confinement; to make somebody be admitted to solitary confinement. 

  • To verify a person's information and record their arrival, such as at a hotel, airport, etc. 

  • To integrate new revisions into the public or master version of a file in a version control system. 

  • To visit in order to see how someone is doing. 

  • To announce or record one's own arrival at a hotel, airport etc. 

  • To contact another person in order to keep the other person informed of one's situation. 

  • To return (a book to a library, source code to a repository, etc.). 

  • To enter solitary confinement at one's own request for protection from other prisoners. 

leave

verb
  • To put; to place; to deposit; to deliver, with a sense of withdrawing oneself. 

  • To cause, to result in. 

  • To let be or do without interference. 

  • To cause or allow (something) to remain as available; to refrain from taking (something) away; to stop short of consuming or otherwise depleting (something) entirely. 

  • To transfer possession of after death. 

  • To give leave to; allow; permit; let; grant. 

  • To produce leaves or foliage. 

  • To give (something) to someone; to deliver (something) to a repository; to deposit. 

  • To depart; to go away from a certain place or state. 

  • To transfer responsibility or attention of (something) (to someone); to stop being concerned with. 

  • To depart from; to end one's connection or affiliation with. 

  • To end one's membership in (a group); to terminate one's affiliation with (an organization); to stop participating in (a project). 

noun
  • The action of the batsman not attempting to play at the ball. 

  • The arrangement of balls in play that remains after a shot is made (which determines whether the next shooter — who may be either the same player, or an opponent — has good options, or only poor ones). 

  • Permission to be absent; time away from one's work. 

  • Permission. 

How often have the words check in and leave occurred in a corpus of books? (source: Google Ngram Viewer )