Learn what "someone from the inside let him in" means, when people say it, and how to use it naturally in English.

It means the speaker believes an insider helped him get access.
From Collateral Hearts, Episode 37
Someone says that a person on the inside helped let him in.
Use this in an investigation or tense argument when suspecting insider help or betrayal. It is more natural in crime or security contexts than in casual talk.
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