embroider, embroidery, ornament
繡 centers on decorating fabric with needle and thread: embroidering, creating embroidery, or adding ornamental stitched designs.
繡 combines 糸 (thread) with 肅, which likely contributes the sound and may relate to careful, solemn work, fitting the meticulous nature of embroidery.
The left side 糸 is thread, and the right side 肅 looks like a solemn, careful hand working with a needle. Picture thread being guided precisely to create ornamental embroidery.
For シュウ, imagine a shoe being embroidered with intricate designs: shoe -> シュウ, and the thread decorates the shoe.