hire vs sign up

hire

verb
  • To accomplish by paying for services. 

  • To occupy premises in exchange for rent. 

  • To employ; to obtain the services of (a person) in exchange for remuneration; to give someone a job. 

  • To accept employment. 

  • To obtain the services of in return for fixed payment. 

  • To exchange the services of for remuneration. 

  • (neologism) (in the Jobs-to-be-Done Theory) To buy something in order for it to perform a function, to do a job 

noun
  • Payment for the temporary use of something. 

  • A person who has been hired, especially in a cohort. 

  • The state of being hired, or having a job; employment. 

sign up

verb
  • To agree to purchase some good or service. 

  • To add one's own name to the list of people who are participating in something (including amateur, but not professional, teams) 

  • To add a name to the list of people who are participating in something. 

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