dismiss vs sign up

dismiss

verb
  • To give someone a red card; to send off. 

  • To get a batsman out. 

  • To reject; to refuse to accept. 

  • To order to leave. 

  • To invalidate; to treat as unworthy of serious consideration. 

  • To send or put away, to discard with disregard, contempt or disdain. (sometimes followed by as). 

  • To discharge; to end the employment or service of. 

  • To dispel; to rid one’s mind of. 

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 dismiss and sign up occurred in a corpus of books? (source: Google Ngram Viewer )