lie-in vs walkout

lie-in

noun
  • A form of protest where a group of people lie down in a public area. 

  • A period spent lying in bed for longer than usual after one has woken up. 

walkout

noun
  • A similar mass action of people leaving a place as a form of protest. 

  • A sudden stoppage of work. 

  • A part of the squat exercise wherein one has to step out from the rack (“walk out” the weight) in order not to hit it during execution. 

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