斬釘截鐵 [ㄓㄢˇ ㄉㄧㄥ ㄐㄧㄝˊ ㄊㄧㄝˇ; zhan3 ding1 jie2 tie3] lit. to chop the nail and slice the iron (idiom) fig. resolute and decisive unhesitating categorical ◄ ►