Learn what "could be someone" means, when people say it, and how to use it naturally in English.

It means the real person involved may be someone familiar, not an obvious suspect.
From School Hall, Episode 27
Someone suggests the culprit may be a close person that nobody suspects.
Use this when speculating about a hidden culprit or unexpected person. It works in mystery or investigation talk, but it is too vague for a strong standalone phrase page.
Scenes unlock real expressions as you watch
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