[1] : WordNet (r) 2.0

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, doze off, drowse off
        ant: wake up
     3: retreat syn: fall back, lose, fall behind, recede
        ant: gain
     4: get worse; "my grades are slipping" syn: slip, drop away,
         fall away
see also:
fall asleep dope off flake out drift off nod off doze off 
drowse off wake up fall back lose fall behind 
recede gain slip drop away fall away 

[2] : Moby Thesaurus II by Grady Ward, 1.0

88 moby thesaurus words for "drop off":
   abate, ablate, bate, be eaten away, buy it, cascade, cash in,
   cataract, check in, check out, collapse, come down, consume,
   consume away, corrode, crash, croak, crumble, decline, decrease,
   deliquesce, descend, die away, diminish, dip down, dive, dope off,
   down, doze off, drop, drop asleep, drop down, drowse off, dwindle,
   ebb, erode, fall, fall asleep, fall away, fall down, fall off,
   go down, go downhill, go to sleep, go west, gravitate, have it,
   kick in, kick off, kick the bucket, knock off, languish, lessen,
   let up, lose altitude, melt away, nod off, parachute, pass out,
   peg out, pipe off, pitch, plummet, plunge, pop off, pounce,
   pour down, precipitate, rain, run low, sag, settle to sleep,
   shove off, shrink, sink, slide, slump, step off, stoop, subside,
   swoop, tail off, trend downward, wane, waste, waste away, wear,
   wear away

Cart Off >> C Words
Cart Off, definition of term: Cart Off
cart+off_pag1.html

Carry Off >> C Words
Carry Off, definition of term: Carry Off
carry+off_pag1.html

Cast Off >> C Words
Cast Off, definition of term: Cast Off
cast+off_pag1.html

Check Off >> C Words
Check Off, definition of term: Check Off
check+off_pag1.html

Chop Off >> C Words
Chop Off, definition of term: Chop Off
chop+off_pag1.html

Call Off >> C Words
Call Off, definition of term: Call Off
call+off_pag1.html

Break Off >> B Words
Break Off, definition of term: Break Off
break+off_pag1.html

Better Off >> B Words
Better Off, definition of term: Better Off
better+off_pag1.html

Bear Off >> B Words
Bear Off, definition of term: Bear Off
bear+off_pag1.html

Bite Off >> B Words
Bite Off, definition of term: Bite Off
bite+off_pag1.html

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