色字頭上一把刀 [ㄙㄜˋ ㄗˋ ㄊㄡˊ ㄕㄤˋ ㄧ ㄅㄚˇ ㄉㄠ; se4 zi4 tou2 shang4 yi1 ba3 dao1] lit. there is a knife above the character for lust fig. lascivious activities can lead to bitter consequences ◄ ►