Learn what "no one even knows that we're onto this" means, when people say it, and how to use it naturally in English.

It means the speaker and others have discovered something, but they have not revealed it yet.
From Mysterious Murderer, Episode 16
The speaker says they have quietly figured something out and no one else knows yet.
Use this in investigation or secretive contexts when you have new information. It sounds natural in mystery stories but is not ideal for formal writing.
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