削铁如泥的英文是「would cut clean through iron as though it were mud」
xue tie ru ni
切削铁器如同斩剁泥土一样。形容兵刃极其锋利。
明·罗贯中《三国演义》第四十一回:“那青釭剑砍铁如泥,锋利无比。”