vow - definition and synonyms

verb [intransitive/transitive] formal 

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/vaʊ/
present tense
I/you/we/theyvow
he/she/itvows
present participlevowing
past tensevowed
past participlevowed
  1. to promise that you will do something
    vow to do something:

    The president has vowed to help the earthquake victims.

    vow (that):

    I vowed that I would never gamble again.