oath

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oath /ˈoʊθ/ noun
plural oaths /ˈoʊðz/
oath
/ˈoʊθ/
noun
plural oaths /ˈoʊðz/
Learner's definition of OATH
[count]
: a formal and serious promise to tell the truth or to do something
old-fashioned : an offensive or rude word that is used to express anger, frustration, surprise, etc.

under oath

law also on oath
: having made a formal promise to tell the truth in a court of law
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