Definitions from Wiktionary (drop-off)

▸ noun:  A sudden downward slope or cliff.
▸ noun:  The precipitous outer side of a coral reef, facing the open sea.
▸ noun:  A decrease; especially, a sudden one.
▸ noun:  A delivery; the act of leaving a package, etc.
▸ noun:  (especially US) A space reserved outside a bus or railway station for vehicles stopping to drop off passengers for onward transit.
▸ noun:  A time during which passengers, such as school children, are dropped off; the event or act of dropping them off.
▸ noun:  (Internet) A visitor to a website who ceases to continue using and navigating around the site after reaching some specified page; or such an act of cessation.
▸ Also see drop-off

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