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English definition of “shelf”

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shelf

noun [C] uk   /ʃelf/ ( plural shelves) us  
A2 a long, flat board fixed horizontally, usually against a wall or inside a cupboard so that objects can be stored on it: a glass shelf on the top/bottom shelf One wall had shelves from floor to ceiling, crammed with books.
See also
specialized geology a flat area of rock underwater or on a cliffoff the shelf If a product can be bought off the shelf, it does not need to be specially made or asked for: It's often cheaper if you buy wallpaper off the shelf, rather than having to order it. off-the-shelf goods/clothesremove sth from your shelves When a shop removes something from its shelves, that product stops being available for sale there.
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(Definition of shelf from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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