做好做歹

zuòhǎozuòdǎi
to persuade using all possible arguments (idiom); to act good cop and bad cop in turn

CEDICT

好说歹说，用尽各种方法劝说。《红楼梦．第一○三回》：「周瑞家的等人大家做好做歹的劝说。」《文明小史．第四九回》：「后来还是家人小子们做好做歹，叫他赔二百块洋钱。」也作「做好做歉」、「做歉做好」。

重編國語辭典

Entry Composition

1 做好 zuòhǎo
  1. to do a good job
  2. to finish; to complete
2 做 zuò
  1. to make; to produce
  2. to write; to compose
  3. to do; to engage in; to hold (a party etc)
  4. (of a person) to be (an intermediary, a good student etc); to become (husband and wife, friends etc)
  5. (of a thing) to serve as; to be used for
  6. to assume (an air or manner)
3 歹 dǎi
  1. bad
  2. wicked
  3. evil
  4. Kangxi radical 78