drop off Meaning, Definition & Usage

1. verb fall or diminish
   
   • The number of students in this course dropped off after the first test
2. verb change from a waking to a sleeping state
   drowse off; drift off; flake out; nod off; dope off; fall asleep; doze off.
   
   • he always falls asleep during lectures
3. verb leave or unload
   unload; drop; put down; set down; discharge.
   
   • unload the cargo
   • drop off the passengers at the hotel
4. verb retreat
   fall back; fall behind; recede; lose.
   
5. verb get worse
   drop away; slip; fall away.
   
   • My grades are slipping

WordNet