Learn what "need to know" means, when people say it, and how to use it naturally in English.

This means they want to monitor someone closely so they can beat him or trap him.
From On One Condition, Episode 34
The speaker says they need to track Ethan closely in order to outmaneuver him.
Use it in a plot-heavy or strategic context, not in normal everyday conversation. The chess image makes it sound calculated and hostile.
Scenes unlock real expressions as you watch
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