DuckCorp Dico

Found one definition

1.                 From The Collaborative International Dictionary of English v.0.48:
                   
   
   
                   
                     
   falloff \falloff\ n.
      a noticeable decline in performance; as, a falloff in
      automobile sales.
      Syn: slump, drop-off, falling off.
           [WordNet 1.5]