Definitions
1.nounA brick or stone structure built against another structure to support it.
2.nounAnything that serves to support something; a prop.
3.nounA buttress-root.
4.nounA feature jutting prominently out from a mountain or rock; a crag, a bluff.
5.nounAnything that supports or strengthens.
6.verbTo support something physically with, or as if with, a prop or buttress.
7.verb(by extension) To support something or someone by supplying evidence; to corroborate or substantiate.