Learn what "you cannot leave this unchecked" means, when people say it, and how to use it naturally in English.

It means the speaker believes the issue needs attention now and should not be ignored.
From In Love With My Godfather's Daughter, Episode 5
The speaker warns that a problem must be dealt with and cannot be ignored.
Use this in serious discussions about problems, mistakes, or risk. It sounds formal and forceful, so it may feel too strong in casual talk.
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