zéi​chū​guān​mén

to lock the door after the thief has left

Senses

贼出关门/ 賊出關門 zéi​chū​guān​mén to lock the door after the thief has left

to take precautions after the event; to be too late; to shut the gate after the thief has already gone

References

variant 贼去关门/賊去關門 贼出关门/賊出關門