lying-in vs travail

lying-in

noun
  • The final stages of pregnancy; accouchement. 

  • A period of postpartum confinement, typically a month or longer, formerly common in Europe and still practiced in some parts of the world. 

adj
  • of, or relating to childbirth or postpartum confinement 

travail

noun
  • Specifically, the labor of childbirth. 

  • Arduous or painful exertion; excessive labor, suffering, hardship. 

verb
  • To toil. 

  • To go through the labor of childbirth. 

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