let (someone) in on (something)

idiom

Definition of let (someone) in on (something)

: to allow (someone) to know (a secret) He said he'd let me in on a secret if I promised not to tell anyone else.

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“Let (someone) in on (something).” The Merriam-Webster.com Dictionary, Merriam-Webster Inc., https://www.merriam-webster.com/dictionary/let%20(someone)%20in%20on%20(something). Accessed 14 December 2019.

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