oath Definition in Cambridge British English Dictionary
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Definition of "oath" - British English Dictionary

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oathnoun [C]

uk   /əʊθ/  us   /oʊθ/

oath noun [C] (PROMISE)

a promise, especially that you will tell the truth in a law court: Medieval knights took an oath of allegiance/loyalty to their lord. The witness placed her hand on the Bible and took the oath (= promised to tell the truth).be under/on oath to have formally promised to tell the truth: The judge reminded the witness that she was under oath.

oath noun [C] (SWEAR WORD)

old-fashioned an offensive word, especially one that uses a name for God: muttering/mouthing oaths
(Definition of oath from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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