This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
The exact historical development of 鬺 is uncertain. It visually contains 鬲, an ancient cooking vessel, but the origin and function of the right side are unclear.
The left side 鬲 looks like a cooking pot. Without a clear meaning, picture a mysterious ancient vessel whose purpose has been forgotten.
For ショウ, imagine showing (ショウ) someone this rare kanji and asking what it means: show -> ショウ.