jam up vs keep in

jam up

keep in

verb
  • to stay blazing (of a fire) 

  • to require a pupil to stay after school as a punishment 

  • to cause (a fire) to stay blazing 

  • Used other than figuratively or idiomatically: see keep, in. 

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