discard, throw away, abandon, resign, reject, sacrifice
捨 centers on letting go of something: discarding, throwing away, abandoning, or resigning from it. The ideas of rejecting and sacrificing are natural extensions of giving something up.
捨 combines 扌 (hand) with 舍, which likely contributes the sound and the idea of releasing or putting aside. The modern form is consistent with this hand-action meaning.
A hand 扌 beside 舍, a shape associated with a dwelling or shed. Picture a hand tossing unwanted items out of a shed: discarding and throwing away.
For シャ, imagine a hand shoving a broken shack (シャック) into the trash: shack -> シャ, and the hand is discarding it.
to throw away; to cast away; to dump; to discard
throwaway; disposable; single-use
cutting a person down (without a second thought); sacrificing; throwing to the wolves; treating as sword fodder
addressing (someone) without using a suffix such as "-san" or "-chan" (considered impolite)
abandoning all worldly desires
to abandon; to fail; to desert; to forsake
littering; (carelessly) tossing away
to cut off and throw away
selection; making a choice; sifting; decision to adopt or reject
putting one's life on the line; giving everything one has got; acting out of desperation
to throw away
rounding (off; a number); rounding half away from zero
to abandon; to throw away; to discard; to forsake
equanimity; upeksa; upekkha
abandoned child; foundling
hermit; recluse
to fling off; to throw off; to cast aside; to abandon; to throw to the winds
almsgiving
ornamental garden stone (placed to give a natural appearance); garden rock
to throw off (clothes); to cast off; to fling off; to kick off (shoes)