· fall or diminish; "The number of students in this course dropped off after the first test"

Hypernym(s): decrease, diminish, lessen, fall

· change from a waking to a sleeping state; "he always falls asleep during lectures"

Synonym(s): fall_asleep, dope_off, flake_out, drift_off, nod_off, doze_off, drowse_off

· remove (cargo, people, etc.) from and leave; "unload the cargo"; "drop off the passengers at the hotel"

Synonym(s): drop, set_down, put_down, unload, discharge

Hypernym(s): deliver

· retreat

Synonym(s): fall_back, fall_behind, recede

Hypernym(s): regress, retrograde, retrogress

· get worse; "My grades are slipping"

Synonym(s): slip, drop_away, fall_away

Hypernym(s): worsen, decline