close the stable door after the horse has bolted
US /kloʊz ðə ˈsteɪbl dɔːr ˈæftər ðə hɔːrs hæz ˈboʊltɪd/
UK /kloʊz ðə ˈsteɪbl dɔːr ˈæftər ðə hɔːrs hæz ˈboʊltɪd/
1.
亡羊补牢, 事后诸葛亮
to take precautions after a misfortune has already happened
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Trying to fix the security breach now is like closing the stable door after the horse has bolted.
现在才试图修复安全漏洞，就像是亡羊补牢。
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They should have implemented stricter rules earlier, but it's too late now; they're just closing the stable door after the horse has bolted.
他们本应早些实施更严格的规定，但现在为时已晚；他们只是在亡羊补牢。