let out phrasal verb ( see also ↑ let )
1 . let out something to suddenly make a loud sound such as a shout or cry
let out a scream/cry/roar etc
He let out a cry of disbelief.
2 . let something ↔ out to make a piece of clothing wider or looser, especially because it is too tight
3 . let something ↔ out British English to charge someone an amount of money for the use of a room or building:
We’re letting out our son’s old room to a student.
4 . American English if a school, college, film etc lets out, it ends and the people attending it can leave:
What time does the movie let out?
⇨ let the cat out of the bag at ↑ cat (2)