(bound form) hinge; pivot (usu. fig.)

Dubhe; Alpha Ursae Majoris in the Big Dipper

censorate

cardinal (Catholicism)

hub (e.g. of traffic network); hinge; pivot; fulcrum

pivot; fulcrum

important hub; key position

privy council

Lingshu Jing (Divine Pivot, or Spiritual Pivot), ancient Chinese medical text (c. 1st century BC)

(anatomy) central nervous system

traffic hub

lit. a door hinge never becomes worm-eaten; constant activity prevents decay (idiom)

cardinal (of the Catholic Church)

(anatomy) nerve center

central nervous system, CNS

lit. flowing water does not rot, nor a door-hinge rust (idiom); fig. constant activity prevents decay