WordWeb Online

1. A noticeable deterioration in performance or quality
   "a falloff in quality";
   - slump, slack, drop-off, falling off

1. Come off
    
2. Fall heavily or suddenly; decline markedly
   "The real estate market fell off";
   - slump, sink
    
3. Diminish in size or intensity
   - fall away

Derived forms: falling off, falls off, falloffs, fell off, fallen off

Type of: come away, come off, declension, decline in quality, detach, deterioration, disappear, drop, go away, vanish, worsening