walk-up
noun [ C ] US uk/ˈwɔːk.ʌp/ us/ˈwɑːk.ʌp/
无电梯的大楼;未配备电梯的公寓(或办公室)
a building with several floors and no elevator (= a device for going from one floor to another) or an apartment or office in such a building
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