This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
賿 combines 貝 (shell, money) with 翏, which likely contributes the sound. The exact historical development is uncertain.
The left side 貝 suggests money or value, but the overall meaning is obscure. Picture a mysterious coin with the 翏 shape stamped on it, its purpose unknown.
For ロウ, imagine a low-value coin with the 翏 mark: low -> ロウ, and the coin is of uncertain worth.