v.1. To allow someone or something to exit from some place; release someone or something: My neighbor let out the dog for the night. After the party, we let the helium out of the balloons.
2. To make some sound: I let a sigh of relief out when I saw my test score. I let out a shriek when I saw the mouse.
3. To come to a close; end: School let out early.
4. To make something known; reveal something: Who let that story out? If you let out the secret, our team will lose.
5. To increase the size of a garment by undoing its seams: The tailor let out my new coat. The kids grew so much this year that I had to let all the hems out on their jeans.
6. To rent or lease something to someone: We decided to let the apartment out for extra income. The neighbors let out the space over the garage to students.