let in
US /lɛt ɪn/
UK /lɛt ɪn/

1.
far entrare, ammettere
to allow someone or something to enter a place
:
•
Could you please let the cat in?
Potresti per favore far entrare il gatto?
•
The bouncer wouldn't let him in because he was underage.
Il buttafuori non lo ha fatto entrare perché era minorenne.
2.
rivelare, far sapere
to reveal a secret or allow someone to know something private
:
•
She accidentally let in on her plans for the surprise party.
Ha accidentalmente rivelato i suoi piani per la festa a sorpresa.
•
Don't let anyone in on our secret.
Non far sapere a nessuno il nostro segreto.