sheath, case, margin, difference, shells (of beans)
鞘 centers on a protective covering that encloses something: a sheath for a blade, a case, or the pod (shell) of beans. The margin/difference sense extends from the idea of a narrow gap or space between the covering and what it holds.
鞘 combines 革 (leather) with 肖, which likely contributes the sound. The character originally referred to a leather sheath or scabbard.
Leather (革) on the left and 肖 on the right: picture a leather sheath covering a blade, like a protective case. The same idea applies to bean pods as natural sheaths.
For ショウ, imagine a show of swords being drawn from their leather sheaths: show -> ショウ, and the sheath is the star of the show.
scabbard; sheath
sea squirt; ascidian
tenosynovitis
myelin sheath (around the axon of a neuron)
margin; spread (in prices)
to bury the hatchet; to make up; to be reconciled; to be reunited (e.g. couple); to be reinstated
ootheca; egg case
coleoptile; acrospire
the world is at peace; bows in bags and swords in sheaths
rivalry in love; rivalry for the heart of a woman
red-lacquered sword sheath
sea pineapple (Halocynthia roretzi)
schwannoma; neurilemmoma
elytron
sheath of tendon
leaf sheath; vagina
to be evasive; to be not entirely truthful; to not be frank
interest margin
to draw a sword
oedogonium (any of a genus of filamentous green algae)