What is the Meaning of LET IN?
let s.o/s.t. in
let in s.o./s.t.
admit, or allow, someone or something into a room, building or area
1. You will arrive at the house before us. You have a key so let yourselves in.
2. I am sorry. I cannot let you in until 9:00 a.m.
3. The security guard knows me, so he will let us in.
Note: Many phrasal verbs have more than one definition. The definitions may not all be shown here.