To use evasive or deliberately vague language:
equivocate, euphemize, hedge, shuffle, weasel. (Informal) pussyfoot, waffle. Idioms: beat about (or around) the bush, mince words. See clearTo abandon one's cause or party usually to join another:
apostatize, defect, desert3, renegade, turn. (Slang) rat. Idioms: change sides, turn one's coat. See approach, trust
Learn more about tergiversate