reins, bridle
繮 centers on the straps used to control a horse: reins and the bridle that holds them.
繮 combines 糸 (thread) with 畺, which likely contributes the sound. The thread component suggests the straps or cords of reins and bridles.
The left side 糸 is thread, and the right side 畺 looks like a series of fields divided by lines. Picture strong threads woven into reins that divide control between rider and horse.
For キョウ, imagine a rider in Kyoto (京都, きょうと) holding the reins tightly: Kyoto -> キョウ, and the reins guide the horse through the old capital.