shelf-n; 4 Senses

Sense Number 1: a support consisting of a horizontal surface for holding objects

Commentary: SHELF[+entity][+physical][+structure][+manmade][+surface][+horizontal][+support][+object]

Examples:
Can you put these books back on the top shelf for me?
Mary wanted glass-enclosed shelves in her kitchen.

Mappings:
WordNet 3.0 Sense Numbers: 1

Sense Number 2: a projecting ridge from a geological formation

Commentary: SHELF[+entity][+physical][+structure][+geological][+ridge][+projecting]

Examples:
We could see a narrow shelf about 300 feet above us, jutting out from the cliff.
His boat got grounded on a soft mud shelf in the shallows.
The continental shelf extends about a hundred miles offshore.

Mappings:
WordNet 3.0 Sense Numbers: 2

Sense Number 3: product taken from existing supply, not made to order

Commentary: Idiom: OFF_THE_SHELF

Examples:
These computer components are all off-the-shelf.

Mappings:
WordNet 0.0 Sense Numbers: idiom_1

Sense Number 4: something no longer in use, on the sidelines

Commentary: Idiom: ON_THE_SHELF

Examples:
His injury kept him on the shelf for years.

Mappings:
WordNet 0.0 Sense Numbers: Idiom_2