臨ㄌㄧㄣˊ渴ㄎㄜˇ穿ㄔㄨㄢ井ㄐㄧㄥˇlínkě‑chuānjǐng

简临渴穿井

  1. 感到口渴才想要打通水井。比喻事到臨頭才要想辦法解決。例 「下週就要跑馬拉松，現在才想練跑，根本是臨渴穿井，來不及啦！」。

英lit. face thirst and dig a well (idiom)​; fig. not to make adequate provision, to act when it is too late