abjure,
forswear,
recant,
resile,
retract formally reject or disavow a formerly held belief, usually under pressure; "He retracted his earlier statements about his religion"; "She abjured her beliefs"
abandon,
give up stop maintaining or insisting on; of ideas or claims; "He abandoned the thought of asking for her hand in marriage"; "Both sides have to give up some claims in these negotiations"
disclaim make a disclaimer about; "He disclaimed any responsibility"
renounce -
leave (a job, post, or position) voluntarily; "She vacated the position when she got pregnant"; "The chairman resigned when he was found to have misappropriated funds"
leave office,
step down,
resign,
quit give up or retire from a position; "The Secretary of the Navy will leave office next month"; "The chairman resigned over the financial scandal"
abdicate,
renounce give up, such as power, as of monarchs and emperors, or duties and obligations; "The King abdicated when he married a divorcee"