adhere (to), cling (to), hew (to), keep (to), stand by, stick (to or with)

cleave (to)advocate, back, champion, confirm, defend, endorse(also indorse), espouse, support, upholdaccept, adopt, cherish, cultivate, embrace, follow, foster, heedbackstop, bolster, boost, buttress, enforce, reinforce(also reenforce)

abide by, live up to

defect (from)

abandon, abnegate, desert, forsake, give up, relinquish, spurn, surrenderabjure, recall, recant, reconsider, renege, renounce, retract, revoke, take back, unsay, withdrawcontrovert, disagree (with), disprove, dispute, rebut, refutecontradict, deny, disavow, disclaim, disown, gainsay, negate, negative, repudiateback down, back off, backtrack