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n. pl. shelves (shĕlvz)Idioms:
a. A flat, usually rectangular structure composed of a rigid material, such as wood, glass, or metal, fixed at right angles to a wall or other vertical surface and used to hold or store objects.
b. The contents or capacity of such a structure.
c. Something, such as a projecting ledge of rock or a balcony, that resembles such a structure.
2. A reef, sandbar, or shoal.
off the shelf
From ready-made merchandise in stock: supplies that were available off the shelf.
on the shelf
1. In a state of disuse or inactivity: The injured goalie has been on the shelf for weeks.
2. Out of consideration: The finance bill is on the shelf until next year.
the amount held on a shelf; the contents of a shelf