dull, slow, unskillful
伹 centers on a lack of sharpness or ability: being dull, slow, or unskillful. The meanings describe a person who is not quick or adept.
伹 combines the person radical 亻 with 且. The exact historical origin is uncertain; it may have been a phono-semantic compound where 且 contributed the sound and the person radical indicated a human quality, but this is not well established.
A person 亻 beside a pile of stacked shelves 且 looks clumsy and slow, as if they are unskillfully trying to organize things.
For ショ, imagine a dull person trying to put on a show but moving so slowly that the audience falls asleep: show -> ショ, but the performance is painfully unskillful.