marry, bride
娵 centers on the act of marrying and the role of a bride. The given meanings are closely related, with 'bride' being the person who marries.
娵 combines 女 (woman) with 取 (take), likely suggesting a woman being taken as a bride. The exact historical development is uncertain.
A woman 女 is taken 取 in marriage, becoming a bride.
For シュ, imagine a bride taking a shoe off at the wedding: shoe -> シュ, and the woman 女 takes 取 it off.