兩肋插刀 [ㄌㄧㄤˇ ㄌㄟˋ ㄔㄚ ㄉㄠ; liang3 lei4 cha1 dao1] lit. knifes piercing both sides (idiom) fig. to attach a great importance to friendship, up to the point of being able to sacrifice oneself for it ◄ ►