(archaic) To pledge.

A solemn pledge or promise that invokes a deity, a ruler, or another entity (not necessarily present) to attest the truth of a statement or sincerity of one's desire to fulfill a contract or promise.

present participle of oath

plural of oath

Third-person singular simple present indicative form of oath

simple past tense and past participle of oath

Inclined to swear oaths, or curse.

A type of euphemism based on a profanity or blasphemy that has been altered to remove the objectionable characteristics of the original expression; polite expletive.

(medicine) An oath sworn by newly-qualified physicians that they will observe the medical ethics that derived from Hippocrates

(Scotland, law, historical) A method for the prevention of calumnious and unnecessary suits, by which both parties at the beginning of a cause swear, either by themselves or their counsel, that the facts set forth by them are true.