Definition of guarantor noun from the Oxford Advanced American Dictionary

 

guarantor

 noun
noun
NAmE//ˌɡærənˈtɔr//
 
, NAmE//ˈɡærənˌtɔr//
 
(formal or law)
 
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a person who agrees to be responsible for someone or for making sure that something happens or is done The United Nations will act as guarantor of the peace settlement.
See the Oxford Advanced Learner's Dictionary entry: guarantor