This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
隯 is a rare character combining the mound radical ⻖ with the phonetic component 壽. Its exact historical development and original meaning are uncertain.
The left side ⻖ suggests a mound or hill, and the right side 壽 is associated with longevity. Picture a long-lived hill that has stood for ages, but its exact meaning remains unclear.
For トウ, imagine a tall, ancient hill (隯) that looks like a towering toe: toe -> トウ.