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1. A feeling of dissatisfaction that results when your expectations are not realized
   - disappointment, sell [Brit, informal]

1. Move something down to a less high position
   "let down the vase from the shelf";
   - lower, take down, get down, bring down
    
2. Fail to meet the hopes or expectations of
   "greatly concerned not to let down a small child";
   - disappoint

Derived forms: let down, letting down, lets down, letdowns

Type of: baffle, bilk [informal], cross, displace, dissatisfaction, foil, frustrate, move, queer [informal], scotch, scupper [informal], spoil, thwart

Encyclopedia: Letdown