Learn the tone, meaning, and better English alternatives around "so they've been" with real scene examples.

It means the speaker believes a group member has secretly been causing harm from within over a period of time.
From Collateral Hearts, Episode 26
Someone realizes that the sabotage has been happening from inside the group all along.
Use this when suspecting insider betrayal or hidden sabotage. It is strong and dramatic, so it fits investigations, workplace conflict, or thriller-style dialogue.
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