adverb
tucking up the hem of one's garments
Describes the action of tucking up the bottom of one's clothes, especially to free the legs for movement or work. Often associated with traditional Japanese clothing like kimono. Can be used adverbially.
彼は川を渡るために着物の裾を尻からげにした。
He tucked up the hem of his kimono to cross the river.
農作業のときは、尻からげにして田んぼに入る。
When doing farm work, they tuck up their clothes and go into the rice paddy.
A more general phrase meaning 'to tuck up the hem'; 尻からげ specifically emphasizes tucking up around the buttocks area for freedom of movement.
Compound of 尻 (buttocks) and からげ (tucking up, from verb からげる). The exact historical derivation is uncertain, but the term vividly describes the action of tucking up clothing around the hips.