drop off

名词 drop off:

1. a noticeable deterioration in performance or quality
   同义词：slump, slack, drop-off, falloff, falling off
2. a steep high face of rock
   同义词：cliff, drop, drop-off
3. a change downward
   同义词：decrease, lessening, drop-off

动词 drop off:

1. fall or diminish
2. change from a waking to a sleeping state
   同义词：fall asleep, dope off, flake out, drift off, nod off, doze off, drowse off
3. leave or unload, especially of passengers or cargo;
   同义词：drop, set down, put down, unload, discharge
4. retreat
   同义词：fall back, lose, fall behind, recede
5. get worse
   同义词：slip, drop away, fall away

1. Interest in the book began to drop off.
   人们对这本书的兴趣开始减退了。
2. Sales dropped off in the fourth quarter.
   销售量在第四个季度减少了
3. I drop off and miss the end of the film.
   我打了个盹儿，把影片的结尾给错过了。
4. Business dropped off sharply during the recession.
   在经济衰退期间，生意大大减少了。