See forswear in Webster's New World Roget's A-Z Thesaurus II
also
foreswear verb
To give up a possession, claim, or right:
abandon, abdicate, cede, demit, hand over, quitclaim, relinquish, render, renounce, resign, surrender, waive, yield. See keepTo make untrue declarations:
falsify, fib, lie2, prevaricate. (Law) perjure. See true
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