twist, make rope
綯 centers on twisting fibers together to create a single strong cord: making rope or string by intertwining strands.
綯 combines 糸 (thread) with 匋, which likely contributes the sound and may relate to shaping or forming, together suggesting twisting threads into rope.
The left side 糸 is thread, and the right side 匋 looks like a potter shaping clay. Imagine twisting many threads together as a potter shapes clay, forming a strong rope.
For トウ, picture twisting a rope so tight it makes a toe-curling tension: toe -> トウ, and the rope is twisted firmly.
starting something in the eleventh hour; have not thy cloak to make when it begins to rain; don't lock the stable door after the horse has been stolen; braiding the rope only after the thief is caught
to twine (fibers to make rope); to twist