This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
The exact historical development of 鄼 is uncertain. It visually combines 賛 and ⻏, but the original semantic and phonetic roles are unclear.
The left side 賛 suggests approval or support, and the right side ⻏ often relates to a place. Picture a gathering place where people come together to show support, but remember this is just a mnemonic—the real meaning is uncertain.
For サン, imagine a sunny gathering place where people assemble: sun -> サン, and the kanji looks like a place (⻏) where people gather (賛).