kick in vs unstop

kick in

verb
  • To start, connect, or take effect, especially in a sudden way. 

  • To kick or strike (a person); to beat up 

  • To kick or strike so as to cause the object struck to collapse or fall inwards. 

  • To contribute, especially to a collection of money. 

unstop

verb
  • To remove a stoppage; to clear a blockage. 

  • To draw out the stops of (an organ). 

  • To unplug or uncork a container. 

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