Learn the tone, meaning, and better English alternatives around "that must mean" with real scene examples.

This means the speaker believes someone inside the group is secretly helping the enemy or leaking information.
From The Marriage Contract, Episode 36
Someone concludes there must be an insider leaking information.
Use it in spy, business, or team-conflict contexts. The phrase sounds dramatic and is not for casual everyday conversation.
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Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor.
Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor.
Lorem ipsum dolor sit amet, consectetur adipiscing elit.