[变脸 / 變臉, biàn liǎnㄅㄧㄢˋ ㄌㄧㄢˇ] to turn hostile suddenly; face changing, a device of Sichuan Opera, a dramatic change of attitude expressing fright, anger etc#18458
[变本加厉 / 變本加厲, biàn běn jiā lìㄅㄧㄢˋ ㄅㄣˇ ㄐㄧㄚ ㄌㄧˋ] lit. change to more severe (成语 saw); to become more intense (esp. of shortcoming); to aggravate; to intensify#31710