From WordNet (r) 3.0 (2006) [wn]:
drop off
v 1: 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}, {dope off},
{flake out}, {drift off}, {nod off}, {drop off}, {doze off},
{drowse off}] [ant: {arouse}, {awake}, {awaken}, {come
alive}, {wake}, {wake up}, {waken}]
3: leave or unload; "unload the cargo"; "drop off the passengers
at the hotel" [syn: {drop}, {drop off}, {set down}, {put
down}, {unload}, {discharge}]
4: retreat [syn: {fall back}, {lose}, {drop off}, {fall behind},
{recede}] [ant: {advance}, {gain}, {gain ground}, {get
ahead}, {make headway}, {pull ahead}, {win}]
5: get worse; "My grades are slipping" [syn: {slip}, {drop off},
{drop away}, {fall away}]
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