braid
絛 centers on the idea of braiding, specifically referring to a braided cord or ribbon. The meaning is narrow and concrete, tied to the physical act of interlacing strands.
絛 combines 糸 (thread) with 攸, which likely contributes a phonetic element. The character specifically denotes a braided silk cord or ribbon, reflecting the thread component.
The thread radical 糸 is wrapped inside the outer shape 攸, like strands being interlaced to form a braid. Picture a hand braiding silk threads into a decorative cord.
For ジュウ, imagine a jeweler braiding thin gold threads into a necklace: jeweler -> ジュウ, and the braided cord becomes a piece of jewelry.