let in on

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

أطلع على, سمح بالاطلاع على

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.
لقد سمحوا لي أخيرًا بالاطلاع على خططهم للحفلة المفاجئة.
She refused to let him in on the secret.
رفضت أن تطلعه على السر.