vow

From Wiktionary

[change] Noun

Singular vow

Plural vows

1. A vow is a promise. Often, a vow is a special promise that is made formally or in front of other people.

   I took a vow never to hurt anyone.

   They said their wedding vows, promising to love each other the rest of their lives.

   The monks took a vow of silence.

[change] Verb

Plain form vow

Third-person singular vows

Past tense vowed

Past participle vowed

Present participle vowing

1. If you vow, to do something, you make a promise to do it.

   We vowed never to betray each other.