adhere (to), cling (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, hold to, 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