[+visitor, guest] faire entrer
→ That'll be Dave at the door. Can you let him in?
→ Go and let them in, Harold.
(into nightclub, bar, party)
They wouldn't let me in because I was under 18. Ils ne m'ont pas laissé entrer parce que j'avais moins de dix-huit ans.
to let o.s. in entrer
→ I let myself in with the spare key.