lock the barn door after the horse has bolted
成語所屬單字barn
lock the barn door after the horse has bolted — 慣用語
1. to act only after the harm has already been done, when the action cannot really
1.慣用語
釋義
事後補救，為時已晚
to act only after the harm has already been done, when the action cannot really help.
例句
Changing the password after the money was stolen was locking the barn door after the horse had bolted.
After three crashes, the new warning signs felt like locking the barn door after the horse had bolted.