This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
逿 combines the movement radical 辶 with the phonetic component 昜. The exact historical meaning is uncertain, but it likely related to passing or exceeding, as suggested by the kun-reading す.ぎる.
The movement radical 辶 wraps around 昜, suggesting something moving past or beyond. Picture a road sign with 昜 inside a walking path, indicating a place to pass through.
For トウ, imagine a toe (トウ) stepping over the 辶 path and past the 昜 component: toe -> トウ, and the foot moves beyond.