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.

Examples of let (someone) in on (something) in a Sentence

Recent Examples on the Web

The plate will leave you feeling like you just got let in on a secret. — Kaitlyn Yarborough, Southern Living, 27 Oct. 2025

The secret was so well-kept that even Digby's best friend was mad she hadn't been let in on it. — Maria Morava, MSNBC Newsweek, 28 Aug. 2025

Those close to Raleigh chuckle at the attention his prodigious production has earned the spotlight-averse catcher, as though they were let in on a secret before anyone else. — Andrew Greif, NBC news, 15 July 2025

Enjoying one of the best breakfasts in Phoenix (shout out to the chorizo, potato, egg and cheese taco) inside a small cottage coffee shop with little to no line feels like being let in on a precious secret. — Eddie Fontanez, AZCentral.com, 3 Apr. 2025