畫蛇添足 [ㄏㄨㄚˋ ㄕㄜˊ ㄊㄧㄢ ㄗㄨˊ; hua4 she2 tian1 zu2] lit. draw legs on a snake (idiom); fig. to ruin the effect by adding sth superfluous to overdo it ◄ ►