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An earnest promise to perform a specified act or behave in a certain manner, especially a solemn promise to live and act in accordance with the rules of a religious order: take the vows of a nun.
v. vowed, vow·ing, vows
1. To promise solemnly; pledge. See Synonyms at promise.
2. To make a pledge or threat to undertake: vowing revenge on their persecutors.
To make a vow; promise.
[Middle English vou, from Old French, from Latin vōtum; see vote.]
To declare or assert: "Well, I vow it is as fine a boy as ever was seen!" (Henry Fielding).
[Short for avow.]