临渴掘井

临渴掘井 [lín kě jué jǐng]

1. ■ not dig a well until one is thirsty -- start acting too late; begin to dig a well when feeling thirsty; do nothing until the last minute; do sth. at the last minute and too late; lack forethought; be caught unprepared and pressed by immediate needs; make no preparation until the last moment; not make timely preparations