definition of
drop off

[1] #1 drop off v. fall or diminish; "The number of students in this course dropped off after the first test". wn

[2] #2 drop off v. change from a waking to a sleeping state; "he always falls asleep during lectures". wn

[3] #3 drop off v. leave or unload; "unload the cargo"; "drop off the passengers at the hotel". wn

[4] #4 drop off v. retreat. wn

[5] #5 drop off v. get worse; "My grades are slipping". wn