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English definition of “vow”

vow

verb [T] uk   /vaʊ/ us  
C2 to make a determined decision or promise to do something: [+ (that)] The guerrillas vowed (that) they would overthrow the government. [+ to infinitive] After the awful meals we had last Christmas, I vowed to do more of the cooking myself.Making and breaking promises and commitments

vow

noun [C] uk   /vaʊ/ us  
C2 a serious promise or decision: [+ to infinitive] She took/made a vow never to lend money to anyone again.Making and breaking promises and commitments
(Definition of vow from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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