english
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general::
Phrase(s): Keep this to yourself. a phrase introducing something that is meant to be a secret. • Andy: Keep this to yourself, but I’m going to Bora Bora on my vacation. Henry: Sounds great. Can I go too? • John: Keep this to yourself. Mary and I are breaking up. Sue: I won’t tell a soul.
McGrawhill's American Idioms And Phrasal Verbs