[亡羊补牢 / 亡羊補牢, wáng yáng bǔ láoㄨㄤˊ ㄧㄤˊ ㄅㄨˇ ㄌㄠˊ] lit. to mend the pen after the sheep are lost (成语 saw); fig. to take action too late; to lock the stable door after the horse has bolted#42655
[へをひってしりつぼめ, hewohitteshiritsubome] (exp) there's no point squeezing your buttocks after you have farted; no use shutting the stable door after the horse has bolted