ph.
在出租车上
1. - see drop 9
2. 打瞌睡;睡着
If you drop off to sleep, you go to sleep.
3. 减退;减少
If the level of something drops off, it becomes less.
1. change from a waking to a sleeping state
e.g. he always falls asleep during lectures
Synonym: fall asleepdope offflake outdrift offnod offdoze offdrowse off
2. fall or diminish
e.g. The number of students in this course dropped off after the first test
3. get worse
e.g. My grades are slipping
Synonym: slipdrop awayfall away
4. retreat
Synonym: fall backlosefall behindrecede
5. leave or unload
e.g. unload the cargo
drop off the passengers at the hotel