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English definition of “shelf”

shelf

noun [C]       /ʃelf/ /ʃelvz/ (plural shelves)
a long flat board fixed horizontally, for example against a wall or inside a cupboard, on which objects are stored or shown for sale: In another room, stacked on every available shelf are four to five hundred large storage boxes. Supermarket shelves are filled with cheap, mass-produced food that is packed with calories. fill/refill the shelves stock/restock the shelves The manufacturer has asked retailers to remove the product from the shelves.
off the shelf COMMERCE, MARKETING if a product can be bought off the shelf, it does not need to be specially made or requested: It's often cheaper if you buy wallpaper off the shelf, rather than having to order it. The electronic components needed to make the sensors were easily available off the shelf.
(Definition of shelf noun from the Cambridge Business English Dictionary © Cambridge University Press)
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