wall unit
US /ˈwɑːl ˌjuː.nɪt/
UK /ˈwɑːl ˌjuː.nɪt/

1.
a piece of furniture or a set of shelves that is designed to be attached to or stand against a wall, often used for storage or display
:
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We bought a new wall unit for the living room to hold our books and media.
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The modern apartment featured a sleek, minimalist wall unit.