1. Remove (cargo, people, etc.) from and leave
   "The taxi drop offd its passengers at the airport";
   - drop, set down, put down, unload, discharge
    
2. Change from a waking to a sleeping state
   "he always drops off during lectures";
   - fall asleep, dope off [informal], flake out [informal], drift off, nod off [informal], doze off, drowse off
    
3. Fall or diminish
   "The number of students in this course dropped off after the first test"
    
4. Fall to a lower standard
   "My grades are dropping off";
   - slip, drop away, fall away
    
5. Retreat
   "The enemy forces dropped off when reinforcements arrived";
   - fall back, fall behind, recede

1. A noticeable deterioration in performance or quality
   "a drop-off in attendance";
   - slump, slack, falloff, falling off
    
2. A steep high face of rock
   "he stood on a high drop-off overlooking the town";
   - cliff, drop
    
3. A change downward
   "there was a sharp drop-off in sales";
   - decrease, lessening

Derived forms: drop-offs, dropping off, drops off, dropped off

See also: fall

Type of: alter, alteration, change, come down, declension [archaic], decline, decline in quality, decrease, deliver, dent, deterioration, diminish, fall, formation, geological formation, go down, lessen, modification, regress, retrograde, retrogress, sink, vary, worsen, worsening

Antonym: advance

Encyclopedia: Drop off