Learn the tone, meaning, and better English alternatives around "we have to keep this highly confidential" with real scene examples.

It means the speaker is saying the information must not be shared with others.
From Echoes Of Vengeance, Episode 19
The speaker says the information must be kept secret.
Use this when stressing privacy or secrecy in work or serious conversations. It sounds formal and serious, which is natural in business settings but not casual talk.
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