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let in on

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let somebody in on something

to tell someone a secret Bill, could you let me in on your techniques for getting along with girls? The plan was so well guarded they only let three people in on it.

Related vocabulary: horn in (on somebody/something)

See also: let, on

let in on

Allow someone to know about or participate in something, as in I'm going to let you in on a little secret. This idiom was first recorded in 1904.

See also: let, on

let (someone) in on

1. To reveal (a secret) to someone: They finally let me in on their plans.

2. To allow someone to participate in (something).

See also: let, on