For somebody’s eyes only
Definition 1 of 1
Pro Tip 1/3Trust Implication
Using this phrase suggests you trust the recipient with sensitive information. 
I'm sending you the plan for your eyes only; it's critical that it stays between us.
Pro Tip 2/3Serious Tone
Conveys a serious, urgent, or important tone, indicating the information is sensitive. 
Remember, the information I gave you is for your eyes only; please handle it with care.
Pro Tip 3/3Expression Origin
Phrase originally implied top-secret documents in military or espionage contexts. 
The spy received a dossier that was for his eyes only and contained mission details.
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