Learn what "there's a mole within us" means, when people say it, and how to use it naturally in English.

It means there is a person secretly betraying the group from the inside.
From Undercovered Heart, Episode 7
Someone warns the group that a hidden traitor is inside their own side.
Use this in serious situations when you suspect someone on your side is leaking information. It sounds dramatic and is not for casual conversation.
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