vow
/icons/point.icon 誓う
swear, swear an oath: 正式にまたは宣誓して誓うこと.
vow: 公にまたはおごそかに誓うこと.
pledge: 特に重責を担う個人・団体・政府機関などが人に固く約束すること.
https://gyazo.com/7dc69c127809e6f979ad64fa7ba803d1
source: Romeo x Juliet | Wedding Vows on Make a GIF
noun
a solemn promise.
«…する/…の» (神かけての)誓い, 誓約 «to do/of»
(vows) a set of promises committing one to a prescribed role, calling, or course of action, typically to marriage or a monastic career.
〖通例～s〗 (結婚や修道生活に入るに際して行う)誓い, 誓約
verb
1. reporting verb solemnly promise to do a specified thing:
｟かたく･主に文｠ ; 〖～ to do/(to A) (that)節〗 …すると, (A〈人〉に)…ということを誓う, 誓約する; ｟かたく｠ …を誓う
e.g. with clause : he vowed that his government would not tolerate a repeat of the disorder
｟書 ｠ 〖直接話法〗…と誓う
e.g. with direct speech : one fan vowed, “I'll picket every home game.”.
2. with object archaic dedicate to someone or something, especially a deity:
｟かたく･古｠ (誓いを立てて) «…に» …をささげる «to»
e.g. I vowed myself to this enterprise.
ORIGIN
Middle English: from Old French vou, from Latin votum (see vote); the verb is from Old French vouer.