the mind > language > statement > assertion or affirmation > [verb (transitive)] > swear an oath or take an oath > state or declare an oath (5)
transitive. To declare or utter solemnly or on oath; to promise with an oath. Obsolete.
transitive. With certain nouns. To proclaim or declare with an oath or solemn affirmation.
technical. transitive with simple object (usually pronominal).
To state or declare upon oath; to depose, v. with simple object; also †to depone an oath (serment).
intransitive and transitive. To swear solemnly.