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.
An essential part of something that provides support.
A portable ornamental column, formerly carried before a cardinal, as emblematic of his support to the church.
A large post, often used as supporting architecture.
The centre of the volta, ring, or manege ground, around which a horse turns.
The body from the hips over the core to the shoulders.
Something resembling such a structure.
To provide with pillars or added strength as if from pillars.