[ verb ] prevent from going to bed at night
"The anticipation of the trip kept the children up all night" "I kept myself up all night studying for the exam"
Used in print(Arthur Miller, "The Prophecy," in The Best...)
She enjoyed great parties when she would sit_up talking and dancing and drinking all night , but it always seemed to her that being alone , especially alone in her house , was the realest part of life .(Robert Heinlein, Stranger in a Strange Land....)
Before midnight he speeded his heart , resumed normal breathing , ran_down his check_list , uncurled and sat_up .