DuckCorp Dico

Found one definition

1.                 From en.wiktionary.org:
                   
   
   
                   
                     
   [drop-off]
   
   ** English
   
   *** Etymology
   [en].
   
   *** Noun
   [en-noun]
   
    1. [en] .
    2. * {{ quote-journal | en | date=March 6, 2007 | author=Jacques Steinberg | title=NBC Names New Chief for News Program | work=New York Times | url=http://www.nytimes.com/2007/03/06/arts/television/06nbc.html
   |passage=[Still, in assuming hands-on, day-to-day responsibility for Mr.
   Williams’s program,] Ms.  Wallace will be charged with maintaining the
   program’s lead in the ratings [over “World News With Charles Gibson” on ABC
   for the television season that began last September —] while trying to staunch
   a DROPOFF in the program’s viewership.}}