一寸光陰一寸金 [ㄧ ㄘㄨㄣˋ ㄍㄨㄤ ㄧㄣ ㄧ ㄘㄨㄣˋ ㄐㄧㄣ; yi1 cun4 guang1 yin1 yi1 cun4 jin1] lit. An interval of time is worth an ounce of gold. (idiom) fig. free time is to be treasured ◄ ►