body, corpse, tree with rotten core
躯 centers on the physical body, especially as a container or shell. It can refer to a living body, a corpse, or metaphorically to a tree with a rotten core, emphasizing the outer form rather than inner vitality.
躯 combines 身 (body) with 区, which likely contributes the sound. The character originally referred to the physical body or corpse. The modern simplified form uses 区 instead of the older 區.
The left side 身 is a body, and the right side 区 looks like a partitioned area. Imagine a body being placed into a coffin-like compartment, emphasizing the outer shell.
For ク, picture a cool body lying still: cool -> ク, and the body is just an empty shell.
(dead) body; corpse
body; physique; build; stature
big frame; large figure; huge body
the whole body
sick body; sickly constitution
lean figure; slender figure
short stature
small stature
one's old bones; aged body
emaciated body
counter for Buddhist images (statues and paintings)
frame (of a building); framework; skeleton
body; trunk; torso; physique
tall and lean figure; tall and slender figure
tall figure