walk-up
noun
Definitions
An apartment or block with stairs rather than an elevator.
An informal visit to a control tower by a pilot, typically used as part of pilot training.
A mountain that can be climbed without specialist equipment.
A customer who arrives without a reservation; a walk-in.
adjective
Definitions
(of an apartment etc) reached by stairs rather than an elevator
(of a block of apartments) containing such flats
(of a service) for which no appointment is necessary; walk-in.