Definition of "walk-up" []

• Reached by stairs rather than an elevator (adjective)
• Containing such flats (adjective)
• For which no appointment is necessary (adjective)
• Such an apartment or block. (noun)
• An informal visit to a control tower by a pilot, typically used as part of pilot training. (noun)

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• "This week's increases cover first-class seats, economy seats that can instantly be upgraded to first-class, and so-called walk-up fares -- tickets bought the day of travel."
• "It’s called a walk-up apartment, and they’re more common in big cities, like New York City or Chicago, than the town I live in: Willow, Oregon, population 39,257."
• "Two years later, she organized her first calendar from a bedbug-infested walk-up with the help of her roommate."