string, cord, braid, lace, tape, strap, ribbon
紐 centers on a flexible linear material used for binding or fastening: a string, cord, braid, lace, tape, strap, or ribbon. The common thread is a narrow, elongated item that ties or secures.
紐 combines 糸 (thread) with 丑, which likely contributes the sound. The character expresses the idea of a cord or string made from thread.
The left side is 糸 (thread), and the right side 丑 looks like a twisted shape. Picture twisted threads forming a strong cord or ribbon.
For チュウ, imagine chewing on a piece of string: chew -> チュウ, and the string is the cord you're chewing.
string; cord
to read (a book); to open (a book) to read
braid; plaited cord
baby backpack; back-mounted baby carrier; sling
baby backpack; back-mounted baby carrier; sling
elastic; elastic cord; elastic band
outside string (on a package)
undersash; belt
child's sash
drawstring (e.g. on a bag)
cord (esp. for suspending something)
small strap tied at the waist of a hanpi
obi and cord fasteners (for a kimono)
drawstring; release cord
braided cord
sling (weapon)
braid
to be linked (esp. of data); to be tied (e.g. to an account); to be related
to link (information, accounts, etc.); to associate; to connect
end of a string