tassels hanging from hat
緌 centers on ornamental hanging cords, specifically the tassels that dangle from a hat. The meaning is narrow and concrete, tied to traditional headgear decoration.
緌 combines 糸 (thread) with 委, which likely contributes the sound. The character is used for tassels or hanging cords, fitting the thread component.
The left side 糸 is thread, and the right side 委 looks like a person bending under a load. Picture threads hanging down from a hat like a person bowing, forming decorative tassels.
For ズイ, imagine a zany hat with tassels swaying as you move: zany -> ズイ, and the tassels swing wildly.