let someone in on a (little) secret

idiom

: to tell someone information that not many people know

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let (someone) have it
let someone in on a (little) secret
let (someone) in on (something)
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“Let someone in on a (little) secret.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/let%20someone%20in%20on%20a%20%28little%29%20secret. Accessed 6 Jul. 2025.

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