打草驚蛇 [ㄉㄚˇ ㄘㄠˇ ㄐㄧㄥ ㄕㄜˊ; da3 cao3 jing1 she2] lit. beat the grass to scare the snake to inadvertently alert an enemy to punish sb as a warning to others (idiom) ◄ ►