let (someone) in on (something)
phrase
: 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.
Cite this Entry
“Let (someone) in on (something).” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/let%20%28someone%29%20in%20on%20%28something%29. Accessed 10 Mar. 2026.
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Merriam-Webster unabridged
