weak, lame
跙 centers on physical weakness or impairment, specifically being lame or unable to walk properly.
跙 combines 足 (foot) with 且, which likely contributes the sound. The exact historical development is uncertain, but the structure suggests a phono-semantic compound related to foot impairment.
The left side is 足 (foot), and the right side 且 looks like a shelf or a barrier. Picture a foot that can't step over a low shelf, making the person lame and weak.
For ショ, imagine a lame person trying to walk but only managing a short, shuffling step: the sound 'sho' mimics that weak, sliding motion.