peg_shelf

1.  A shelf is a flat piece of wood, metal, or glass which is attached to a wall or to the sides of a cupboard. Shelves are used for keeping things on.

2.  A shelf is a section of rock on a cliff or mountain or underwater that sticks out like a shelf.  

3. If you buy something off the shelf, you buy something that is not specially made for you.

 

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