To forswear

The 'Lectric Law Library's Legal Lexicon On
* TO FORSWEAR *
To swear to a falsehood.

TO FORSWEAR, crim. law, torts. To swear to a falsehood.
2. This word has not the same meaning as perjury. It does not, ex vi termini, signify a false swearing before an officer or court having authority to administer an path, on an issue.

abjurare, to forswear), a solemn repudiation or renunciation on oath. At common law, it signified the oath of a person who had taken sanctuary to leave the realm for ever; this was abolished in the reign of James I.

Abjuration is the solemn repudiation, abandonment, or renunciation by or upon oath, often the renunciation of citizenship or some other right or privilege. It comes from the Latin abjurare, "to forswear").
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See also: Swear, Swearing, Oath, Person, Word