take up the hem

Translations
подшить подол
She decided to take up the hem of her dress to make it shorter.
Она решила подшить подол своего платья, чтобы сделать его короче.
Definitions
To take up the hem means to shorten the bottom edge of a garment, typically by folding it and sewing it in place, in order to adjust the length for a better fit.