1. let down - Noun
2. let down - Verb
move something or somebody to a lower position
fail to meet the hopes or expectations of
Source: WordNetlet-down
take down the vase from the shelf Source: Internet
Her boyfriend let her down when he did not propose marriage Source: Internet
AIDS taught us that we cannot let down our guard. Source: Internet
As a result, the crowd was understandably let down by what followed, when it had promised so much. Source: Internet
At times, we feel let down, we go through loss, and experience grief. Source: Internet
BC on the other hand, had that let down at Syracuse after the Clemson game and should be well prepared from the neck up. Source: Internet