let in on

US /let ɪn ɑːn/
UK /let ɪn ɑːn/
"let in on" picture
1.

memberi tahu, membiarkan tahu

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 membiarkan saya tahu rencana mereka untuk pesta kejutan.
She refused to let him in on the secret.
Dia menolak untuk membiarkan dia tahu rahasianya.