continue, carry on, hand down, to join
佋 centers on the idea of passing something along or linking things together: continuing a line, handing down traditions, or joining one thing to another.
佋 combines 亻 (person) with 召, which likely contributes the sound and may relate to calling or summoning, but the exact historical development of the meaning 'continue, hand down' is uncertain.
A person 亻 beside 召 (summon) suggests someone being called to carry on a task or tradition, passing it along to the next generation.
For ショウ, imagine a person handing down a show: show -> ショウ, and the performance continues from one generation to the next.