臨渴掘井 [ㄌㄧㄣˊ ㄎㄜˇ ㄐㄩㄝˊ ㄐㄧㄥˇ; lin2 ke3 jue2 jing3] lit. not to dig a well until one is thirsty to be unprepared and seek help at the last minute (idiom) ◄ ►