a vertical or very steep descent
: The trail has a drop-off of several hundred feet.
a decline; decrease: Sales have shown a considerable drop-off this year.
a place where a person or thing can be left, received, accommodated, etc.: a new drop-off for outpatients.
applied when a rented vehicle is left elsewhere than at the point of hire: to pay a drop-off charge.
1955–60; noun, adj. use of verb phrase drop off
is always a great word to know.
So is gobo. Does it mean: