charter vs sign on

charter

verb
  • To grant or establish a charter. 

  • To lease or hire something by charter. 

  • (of a peace officer) To inform (an arrestee) of their constitutional rights under the Canadian Charter of Rights and Freedoms upon arrest. 

adj
  • Leased or hired. 

noun
  • A special privilege, immunity, or exemption. 

  • A deed (legal contract). 

  • The temporary hiring or leasing of a vehicle. 

  • A contract for the commercial leasing of a vessel, or space on a vessel. 

  • a provision whose unintended consequence would be to encourage an undesirable activity 

  • A similar document conferring rights and privileges on a person, corporation etc. 

  • A document issued by some authority, creating a public or private institution, and defining its purposes and privileges. 

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