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Antonyms - adopt, defend, occupy, seek, advocate , favour , prosecute ,support, assert, haunt, protect, undertake, cherish, hold, pursue, uphold, claim, keep, retain, vindicate, court, maintain.
Synonyms - abdicate, desert, leave, resign, abjure, discontinue, quit, retire from, cast off, forego, recant, retract, cease, forsake, relinquish, surrender, cede, forswear, renounce, vacate, depart from, give up, repudiate, withdraw from.