Idiom
let out somethinglet out (something)
1.
to make a piece of clothing larger.
Can this skirt be let out at the side?
2.
to make something known.
If anyone lets out this information, they will face immediate punishment.
3.
to suddenly make a sound.
Elena let out an ear-splitting scream as her brother, Julio, disappeared over the wall.
Usage notes: often said about laughing or shouting