沸 ㄈㄟ ˋ fèi 腾 ㄊㄥ ˊ téng 沸 ㄈㄟ ˋ fèi 騰 ㄊㄥ ˊ téng (of a liquid) to boil (of sentiments etc) to boil over to flare up to be impassioned