let in on
US /let ɪn ɑːn/
UK /let ɪn ɑːn/

1.
membenarkan tahu, memasukkan ke dalam
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.
Mereka akhirnya membenarkan saya tahu rancangan mereka untuk parti kejutan itu.
•
She refused to let him in on the secret.
Dia enggan membenarkan dia tahu rahsia itu.