expression, ichidan verb
Literally 'raise one's buttocks'; used when someone rises from a seated position, often implying a sudden or noticeable movement.
彼は椅子から尻を上げて立ち上がった。
He raised his butt from the chair and stood up.
expression, ichidan verb
Figurative use: to get up and leave a place, often with a nuance of quitting or walking away from a situation.
彼は何も言わずに尻を上げて出て行った。
He got up and left without saying a word.