Wiktionary
let in
vb. To let someone or something come in; to admit someone or something inside.
WordNet
let in
v. allow participation in or the right to be part of; permit to exercise the rights, functions, and responsibilities of; "admit someone to the profession"; "She was admitted to the New Jersey Bar" [syn: admit, include] [ant: exclude]
allow to enter; grant entry to; "We cannot admit non-members into our club" [syn: admit, allow in, intromit] [ant: reject]