Learn what "i already ran a background check on you" means, when people say it, and how to use it naturally in English.

It means someone has secretly looked into your past or identity, often to verify facts or find suspicious details.
From I Think My Wife Wants To Kill Me S2, Episode 51
He says he has already investigated the other person’s background.
Use this in a serious or accusatory context when you want to signal that you have investigated someone. It can sound invasive or threatening in normal conversation.
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