誓(ちか)う

to swear; to vow

誓(ちか)い

vow; pledge

誓(ちか)い合(あ)う

to pledge to each other

宣誓(せんせい)

oath; swearing-in

誓約書(せいやくしょ)

written pledge; written oath

誓(ちか)って

I swear; upon my word

誓(ちか)いの言葉(ことば)

words of a vow; wedding vows

誓約

私(わたし)は約束(やくそく)を守(まも)ると誓(ちか)う。

I swear I will keep my promise.

二人(ふたり)は愛(あい)を誓(ちか)い合(あ)う。

The two of them pledge their love to each other.