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warrant

verb [I or T] (PROMISE)
 
 
/ˈwɒr.ənt/ US  /ˈwɔːr-/ old-fashioned

Definition

to say that you are certain about somethingMaking and breaking promises and commitments
(Definition of warrant verb (PROMISE) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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