hostage vs instrument

hostage

noun
  • A person given as a pledge or security for the performance of the conditions of a treaty or similar agreement, such as to ensure the status of a vassal. 

  • The condition of being held as security or to compel someone else to act or not act in a particular way. 

  • Something that constrains one's actions because it is at risk. 

  • A person seized in order to compel another party to act (or refrain from acting) in a certain way, because of the threat of harm to the hostage. 

  • One who is compelled by something, especially something that poses a threat; one who is not free to choose their own course of action. 

verb
  • To hold (someone or something) hostage, especially in a way that constrains or controls the person or thing held, or in order to exchange for something else. 

  • To give (someone or something) as a hostage to (someone or something else). 

instrument

noun
  • A legal document, such as a contract, deed, trust, mortgage, power, indenture, or will. 

  • A device used to produce music. 

  • A means or agency for achieving an effect. 

  • A tool, implement used for manipulation or measurement. 

  • A person used as a mere tool for achieving a goal. 

  • A measuring or displaying device. 

verb
  • To devise, conceive, cook up, plan. 

  • To perform upon an instrument; to prepare for an instrument. 

  • To apply measuring devices. 

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