drop off

verb

1. fall or diminish

   verb.change

   Source: WordNet 3.0

2. change from a waking to a sleeping state

   verb.body

   Synonyms dope off doze off drift off drowse off fall asleep flake out nod off

   Antonyms arouse awake awaken come alive wake wake up waken

   Source: WordNet 3.0

3. leave or unload

   verb.contact

   Examples

   Drop off the passengers at the hotel.

   Synonyms discharge drop put down set down unload

   Source: WordNet 3.0

4. retreat

   verb.competition

   Synonyms fall back fall behind lose recede

   Antonyms advance gain gain ground get ahead make headway pull ahead win

   Source: WordNet 3.0

5. get worse

   verb.change

   Synonyms drop away fail fall away slip suffer

   Source: WordNet 3.0