Learn what "you forgot to lock the door" means, when people say it, and how to use it naturally in English.

It means the speaker is telling someone they failed to secure the door, which could be unsafe.
From Twist Of Time, Episode 38
Someone points out that another person left the door unlocked.
Use this to point out a safety mistake or remind someone about security. It can sound accusatory if said sharply.
Scenes unlock real expressions as you watch
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