This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
紏 combines 糸 (thread) with 斗 (a measuring ladle). The exact historical development is uncertain, but it likely originally referred to a type of cord or twisted thread, possibly related to the sound 斗.
The left side is thread 糸, and the right side is a measuring ladle 斗. Imagine a thread being twisted around the handle of a ladle to form a cord.
For トウ, imagine a toe being wrapped with thread: toe -> トウ, and the thread twists around it.