Anything that serves to support something; a prop.
A brick or stone structure built against another structure to support it.
Anything that supports or strengthens.
A buttress-root.
A feature jutting prominently out from a mountain or rock.
To support something or someone by supplying evidence.
To support something physically with, or as if with, a prop or buttress.
A central cohesive source of stability and security; a person or thing that is critical to a system or organisation.
A pin inserted through holes at the end of an axle or shaft, so as to secure a wheel or shaft-mounted device.
To adopt as, or serve as, a central cohesive source of stability and security.