Literally, it means lowered gently. Figuratively it means disappointed. The noun is usually spelled as one word: "letdown". Examples: "He let down the piano from the second-story window on a rope and pulley." "I am counting on you to help me out here; don't let me down." "The trailer of the movie looked so good, but the film itself was a letdown."
When a person feels let down, it means that the person hoped or planned for something, but it didn't work out.
The opera was a bit of a let down this evening.I love to let down my hair.
You need to let them down nicely.
Let It Down was created in 1970.
I think you are looking for "PhD" with "I Won't Let You Down".
Rapunzel. Oh, and it's 'let down your hair' not let's down your hair
Never Let You Down was created in 1999.
Let Down was created on 2005-06-28.
I Won't Let You Down was created in 1981.
Let's Get Down was created on 2003-06-24.
You let someone down by telling lies. One can let some down by disclosing confident information. Anything that betrays trust will lead to letting down.
Let Your Hair Down was created in 1973-11.
The expression ''let your hair down'' means be free and bold.