sit up
—phrasal verbwithsitverbuk/sɪt/us/sɪt/present participlesitting|past tense and past participlesat
(STRAIGHT)
tositwith astraightback
坐直
How manytimesdo I have totellyou tositupstraight?我已经告诉你多少次了要坐直？
(STAY AWAKE)
tostayawakeand not go tobedalthoughit is late
迟睡，熬夜
[+ -ing verb]Thebookwas sointerestingthat Isatup allnightreadingit.这本书太有趣了，我读了个通宵达旦。
I'll be latetonight, so don'tsitupfor(=waitfor)me.今晚我会回来得很晚，所以不要熬夜等我。
(NOTICE)
informal
to showinterestorsurprise
感兴趣；惊讶
Thenewsthat he was gettingmarriedreally made hersitup.他要结婚的消息着实让她感到惊讶。