Drop Off
 

drop off
verb1.fall or diminish; "The number of students in this course dropped off after the first test"2.change from a waking to a sleeping state; "he always falls asleep during lectures"[syn: fall asleep][ant: arouse]3.leave or unload; "unload the cargo"; "drop off the passengers at the hotel"[syn: drop]4.retreat[syn: fall back][ant: advance]5.get worse; "My grades are slipping"[syn: slip]