pledge, swear – 盟誓 [maengse]
Etymology
盟 (맹) [maeng] – to swear, to pledge;
誓 (세) [se] – swear, pledge;
Verbs
맹세하다, 맹세하나이다 – to make a pledge, to swear;
하나이다 is a special form of speaking. In modern Korean, it is used when addressing God in prayer.
noun (명사), sino-korean
Hanja characters: 盟，誓