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drop off
Take something or someone to a place and leave it or them there.
Fall asleep
Decrease in number or amount
drop out
Quit a course
drop in
Visit without having made arrangements
drop someone in it
Get someone into trouble
drop through
Come to nothing, produce no results
drop back
Move towards the back of a group
drop round
Visit someone, often without making an arrangement
Deliver
drop over
Visit for a short time
drop around
Visit someone, often without making an arrangement
Deliver
drop away
Become smaller
amount, numbers
drop by
Pay a brief visit