Learn what "make sure it doesn't happen again" means, when people say it, and how to use it naturally in English.

It means the speaker wants the other person to avoid repeating a mistake.
From I'M Obsessed With My Boss Part I, Episode 16
A superior warns someone to prevent the same mistake from happening again.
Use this when correcting someone and stressing that the problem must not repeat. It can sound stern or threatening at work if said sharply.
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