let down
Definitions
To fail to support or help someone as they had hoped or expected.
To lower something, such as a hem or a rope.
To deflate or release air from something, such as a tire.
Examples
I felt like I had let down my team when I missed the final goal.
Please don't let me down this time; I am counting on your help.
The movie was a huge let down after all the positive reviews I had read.
Synonyms
disappoint fail dissatisfy dash sadden dishearten underwhelm