let out
verb
Definitions
To release.
Example: If you go into the aviary, don't let out any of the birds!
Of a school: to finish for the day or term, allowing the pupils to go home.
To allow to operate at higher speed by adjusting controls.
Example: He let out the reins when they were a mile from the barn.
(of clothing) To enlarge by adjusting one or more seams.
Example: After the holidays he had to have his suits let out.