shack up vs wife

shack up

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

wife

verb
  • to marry (a woman) 

noun
  • A married woman, especially in relation to her spouse. 

  • The female of a pair of mated animals. 

  • Synonym of woman. 

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