To vow is to make an earnest promise or pledge. People getting married often vow to stick together “till death do us part,” while a presidential candidate might vow to lower taxes.

You can use vow as both a noun and a verb: A vow is a solemn declaration; to vow is the act of making that promise. Vows are meant to be serious, sacred things, even vows made with the best intentions can be broken. Wrote American short-story writer and poet Dorothy Parker, “By the time you swear you are his, shivering and sighing, And he vows his passion is infinite and undying—Lady, make a note of this: One of you is lying.”

Definitions of vow
  1. noun
    a solemn pledge (to oneself or to another or to a deity) to do something or to behave in a certain manner
    “they took vows of poverty”
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    type of:
    assurance, pledge
    a binding commitment to do or give or refrain from something
  2. verb
    make a vow; promise
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    affiance, betroth, engage, plight
    give to in marriage
    take vows, as in religious order
    promise solemnly; take an oath
    take the veil
    become a nun
    type of:
    pledge, plight
    promise solemnly and formally
  3. verb
    dedicate to a deity by a vow
    synonyms: consecrate
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    type of:
    commit, consecrate, dedicate, devote, give
    give entirely to a specific person, activity, or cause
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