守

The core sense is the act of remaining at a post or occupying a space to ensure boundaries are maintained, preventing entry from without and decay/leakage from within. Its range includes:

• Physical: Guarding, defending, or sentinel duty.
• Abstract: Conserving, observing, or adhering to standards (e.g., rites 禮, promises, traditions).
• Internal/Philosophical: Focused concentration—such as "guarding the mind" (守心) or "guarding the one" (守一)—meaning the prevention of spirit or attention from being dissipated by external distractions.

Primarily used as a transitive verb. It often implies a stative aspect of ongoing vigilance. Occurs occasionally as a noun meaning "the guard" or "sentinel," usually when specified by an accompanying agent noun.

• vs. 衛 (wèi): While 衛 emphasizes the perimeter or the shield, 守 emphasizes the occupation of the position and the steadfastness of the occupant.
• vs. 持 (chí): While both involve "keeping," 持 refers to the grip (the handling of an object or active maintenance of a standard), whereas 守 refers to position (the refusal to be displaced).
• vs. 保 (bǎo): 保 focuses on protection and preservation; 守 focuses on vigilance and steadfastness.