shack vs shack up

shack

verb
  • To live (in or with); to shack up. 

  • To wander as a vagabond or tramp. 

  • To drink, especially alcohol. 

  • To hibernate; to go into winter quarters. 

noun
  • A crude, roughly built hut or cabin. 

  • Any poorly constructed or poorly furnished building. 

  • Bait that can be picked up at sea. 

  • A drink, especially an alcoholic one. 

  • The room from which a ham radio operator transmits. 

shack up

verb
  • To live together, especially of an unmarried couple. 

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