noun
/ˈʃɛlf/ , pl shelves /ˈʃɛlvz/
[count] a flat board which is attached to a wall, frame, etc., and on which objects can be placed
geology :a flat area of rock, sand, etc., especially underwater
off the shelf
directly from a store without having to be specially made or ordered
on the shelf
in an inactive state :not active or being used