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In Criminal Law, to make oath to that which the deponent knows to be untrue. This term is wider in its scope than perjury, for the latter, as a technical term, includes the idea of the oath being taken before a competent court or officer and relating to a material issue, which is not implied by the word forswear.
forswearverb abandon, abhor, abjure, abnegate, avoid, break off, cast aside, cast away, cast off, decline, deny, desert, disaccustom, discard, disclaim, discontinue, disdain, dispense with, divest oneself, do without, drop, eschew, forego, forsake, give up, lay aside, leave, let alone, omit, part with, proscribe, quit, refrain from, refuse, reject, relinquish, renounce, repel, repudiate, sacrifice, scorn, shun, spurn, toss aside, waive, withdraw from, yield
See also: abandon, answer, bear false witness, betray, cloak, contradict, deceive, deny, disavow, disclaim, discontinue, disown, eschew, exclude, fabricate, falsify, forfeit, forgo, lie, palter, perjure, prevaricate, quit, refuse, reject, relinquish, renounce, reply, repudiate, surrender