What Does “Cantilever” Mean
A projecting beam or other horizontal member supported at one or more points but not at both ends.
Any rigid construction extending horizontally well beyond its vertical support, used as a structural element of a bridge, building foundation, gate, etc.
“Any beam built into a wall with a projecting free end forms a cantilever. Cantilevering can be used for constructions as simple as bookshelves or as complicated as bridges.”