let in on - definition and synonyms

phrasal verb [transitive]
present tense
I/you/we/theylet in on
he/she/itlets in on
present participleletting in on
past tenselet in on
past participlelet in on

or let into

  1. let someone in on something to tell someone a secret

    If you promise not to tell, I’ll let you in on a secret.

    They were planning something, but they wouldn’t let me in on it.

See also main entry: let