oath

A solemn, formal declaration or promise to fulfill a pledge, often calling on God, a god, or a sacred object as witness.

The words or formula of such a declaration or promise.

Something declared or promised.

An irreverent or blasphemous use of the name of God or something held sacred.

An imprecation; a curse.

(take an oath) To agree to a pledge of truthfulness or faithful performance.

(under oath) Under a burden or responsibility to speak truthfully or perform an action faithfully.

To make to take an oath; put to the oath.

To use as an oath; swear by.