sit-up

He sits up very late, to the detriment of his health.

他经常熬夜, 损害健康。

Dorothy could ramble all day on the hills and sit up talking to Coleridge all night without being scolded by her aunt for unwomanly behaviour.

白天，多茜可以整天在山上漫步；晚上，她可以整夜与柯律支聊天，而不用担心姨妈会为此责备她不像个淑女。