bridal veil, to tie, to bind
縭 centers on a thin fabric used to cover or connect: a bridal veil, or the act of tying and binding with a cord or cloth.
縭 combines 糸 (thread) with 离, which likely contributes sound. The character is associated with fabric items like a veil and the action of tying.
The left side 糸 is thread, and the right side 离 looks like a mysterious veil. Imagine a bride's veil made of fine threads, tied and bound with silk cords.
For リ, picture a bride tying her veil with a ribbon: ribbon -> リ, and the thread 糸 binds the veil in place.