surety - definition and synonyms

noun legal 

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/ˈʃʊərəti/
singularsurety
pluralsureties
  1. [countable] someone who agrees to pay money if you do not go to court when you should, or if you do not pay money that you owe
    1. a.
      [uncountable] money that someone gives to make sure that someone else will appear in court or pay money that they owe