dress up
娤 centers on the act of dressing up or adorning oneself, with a focus on personal appearance.
娤 combines 女 (woman) with 壯, which likely contributes the sound and the idea of strength or adornment, suggesting a woman dressing up or being adorned.
A woman (女) with a strong, impressive appearance (壯) is dressing up: 娤 means to dress up.
For ソウ, imagine a woman dressing up in a beautiful silk (silk -> ソウ) gown, tying the sound to the act of adorning herself.