Forswear

Verb

 * 1)  To renounce or deny something, especially under oath.
 * 2)  To commit perjury.

Thesaurus
abandon, abdicate, abjure, acknowledge defeat, assert the contrary, back down, back out, backwater, belie, brush aside, cease, cede, chuck, chuck out, climb down, contemn, contest, contradict, contravene, controvert, counter, crawfish out, cross, cry quits, decline, deny, desist from, despise, disaffirm, disallow, disapprove, disavow, discard, disclaim, discontinue, discount, disdain, disgorge, dismiss, disown, dispense with, dispose of, disprove, dispute, disregard, do without, drop, dump, eat crow, eat humble pie, except, exclude, forgo, gainsay, get along without, get rid of, give away, give over, give up, hand over, have done with, ignore, impugn, join issue upon, kiss good-bye, lay down, leave off, make a sacrifice, not accept, not admit, nullify, oppose, palinode, part with, pass by, pass up, push aside, quitclaim, rebuff, recall, recant, refuse, refuse to admit, refuse to consider, refute, reject, relinquish, render up, renege, renounce, repel, repudiate, repulse, resign, retract, revoke, sacrifice, scout, shove away, spare, spurn, stop, surrender, swallow, swear off, take back, take issue with, take the pledge, throw away, throw out, throw up, turn away, turn out, unsay, vacate, waive, withdraw, yield

Alternative forms

 * foreswear

Etymology
forsweren: from forswerian:. More at.