This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
The exact historical development of 綂 is uncertain. It visually contains 糸 (thread) on the left, but the origin and function of the right-side component are unclear.
The left side 糸 suggests thread or fabric, but the overall meaning is unclear. Picture a tangled thread that resists interpretation.
For トウ, imagine a toe tangled in thread: toe -> トウ, and the thread wraps around it.