drop-off

noun
1
a reduction or fall
کاهش, نزول, افت
2
the action of stopping your car so that somebody can get out; the action of delivering somebody/something to a place
پیاده کردن, تحویل دادن, رساندن, تحویل
The area outside the airport terminal is for pickups and drop-offs only.
The road is busy with parents doing school drop-offs.
Drop-offs of food donations are welcome between 8 and 3.
The kidnappers told them to bring the money to a drop-off point.
3
a very steep slope downwards
شیب تند, سرازیری تند, سراشیبی
Be careful when going into the lake as there's a steep drop-off.
a path with sheer drop-offs to either side