1. A feeling of disappointment when expectations are not met
   "After months of anticipation, the movie was a real letdown";
   - disappointment, sell [Brit, informal], comedown [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: lets down, let down, letdowns, letting down

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

Encyclopedia: Letdown