let in on
US /let ɪn ɑːn/
UK /let ɪn ɑːn/
1.
посвятить в, дать знать
to allow someone to share a secret or to know something that is not known by many people
:
•
They finally let me in on their plans for the surprise party.
Они наконец-то посвятили меня в свои планы на вечеринку-сюрприз.
•
She refused to let him in on the secret.
Она отказалась посвящать его в тайну.