oathEnglishOxford Dictionary of Englishoath /əʊθ / ▸ noun (plural oaths /əʊðz/) 1 a solemn promise, often invoking a divine witness, regarding one's future action or behaviour: they took an oath of allegiance to the king. ▪ a sworn declaration, such as the promise to tell the truth, in a court of law: each took the oath and then gave evidence. 2 a coarse or blasphemous word or phrase used to express anger or other strong emotion: he exploded with a mouthful of oaths he was muttering foul oaths. – PHRASES my oath Australian and New Zealand English an exclamation of agreement or endorsement. under oath (British English on oath) having sworn to tell the truth, especially in a court of law: he was made to testify under oath I would swear on oath that she had not seen me.– ORIGIN Old English āth, of Germanic origin; related to Dutch eed and German Eid.
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EnglishOxford Dictionary of English