Origin of drop-off
Examples from the Web for drop-off
The effort has not just been focused on “drop-off” voters—that is, Democrats who voted in 2012 but not in the 2010 midterms.
Not far from the drop-off point, the team ran into their first roadblock.
The drop-off is even steeper over the past 30 years: in 1982 the number was 56.4 percent.How We Read Now: 10 Facts from the National Endowment for the Arts Report|Thomas Flynn|September 26, 2013|DAILY BEAST
The U.S. economic recovery, largely driven by a recovery in housing, could be threatened by this drop-off.Rising interest rates spur drop in mortgage financing activity|Edward Ferguson|July 12, 2013|DAILY BEAST
But I would expect to see some drop-off in applications, perhaps a substantial one.
A fine, large fire was started on the ledge of rock that extended out from the "Shelter" to a drop-off of some twenty feet.The Meadow-Brook Girls in the Hills|Janet Aldridge