wake a sleeping dog :
1.招惹是非
2.惹麻烦
3.打草惊蛇
例句
1.Don't wake a sleeping dog.
别多事,别惹麻烦.
2.Let a sleeping dog lie.
莫惹事生非.
3.It is ill to waken sleeping dogs./ Let sleeping dogs lie./ Don’t wake a sleeping dog.
别多事,别惹麻烦.