call off vs muster

call off

verb
  • To telephone in one's notice of a day's absence from work. 

  • To recall; to cancel or call a halt to. 

muster

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 

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. 

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