let in
US /lɛt ɪn/
UK /lɛt ɪn/

1.
dejar entrar, permitir la entrada
to allow someone or something to enter a place
:
•
Could you please let the cat in?
¿Podrías por favor dejar entrar al gato?
•
The bouncer wouldn't let him in because he was underage.
El portero no lo dejó entrar porque era menor de edad.
2.
revelar, confiar
to reveal a secret or allow someone to know something private
:
•
She accidentally let in on her plans for the surprise party.
Accidentalmente reveló sus planes para la fiesta sorpresa.
•
Don't let anyone in on our secret.
No reveles nuestro secreto a nadie.