tire vs work up

tire

verb
  • To become bored or impatient (with). 

  • To bore. 

  • To become sleepy or weary. 

  • To make sleepy or weary. 

noun
  • A covering for the head; a headdress. 

  • A tier, row, or rank. 

  • A child's apron covering the upper part of the body, and tied with tape or cord; a pinafore. Also tier. 

work up

verb
  • To raise; to excite; to stir up. 

  • To give (a patient) a general medical examination to assess health and fitness. 

  • To develop. 

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