muster vs sign on

muster

verb
  • To enroll (into service). 

  • To collect, call or assemble together, such as troops or a group for inspection, orders, display etc. 

  • To be gathered together for parade, inspection, exercise, or the like (especially of a military force); to come together as parts of a force or body. 

  • To gather or round up livestock. 

noun
  • An assemblage or display; a gathering, collection of people or things. 

  • The sum total of an army when assembled for review and inspection; the whole number of effective men in an army. 

  • A roundup of livestock for inspection, branding, drenching, shearing etc. 

  • A collection of peafowl. (not a term used in zoology) 

  • An assembling or review of troops, as for parade, verification of numbers, inspection, exercise, or introduction into service. 

  • Synonym of mustee 

sign on

verb
  • To join something, after signing. 

  • To begin broadcasting a radio or television signal, usually at the beginning of a broadcasting day and after being off the air for several hours. 

  • To commit oneself, as to a project, a goal, an organization, a cause. 

  • To apply to receive unemployment benefits. 

  • To log on; to start using a computer, radio, etc., or to start talking. 

noun
  • The time of day when a radio or television station begins broadcasting, usually after being off the air for several hours. 

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