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let in on

B1 informal separable transitive

In simple words

To tell someone a secret that only a few people know.

Meanings

1 B1 idiomatic informal

common

To share a secret, joke, or private plan with someone who was previously unaware of it.

"Come on, let me in on the secret — everyone else seems to know."

Grammar: separable

2 B2 idiomatic informal

uncommon

To allow someone to participate in or benefit from something exclusive or private.

"His uncle let him in on the business deal before it was announced publicly."

Grammar: separable

Usage notes

Almost always used with 'secret', 'joke', or 'plan'. The person being told is the direct object: 'let me in on the secret.' Very natural in spoken English.

Commonly used with

secret joke plan truth scheme surprise

Forms

Base

let in on

I/you/we/they

3rd person

lets in on

he/she/it

Past simple

let in on

yesterday

Past participle

let in on

have + pp

-ing form

letting in on

continuous

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Synonyms

reveal to share with confide in clue in fill in tell

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