Stand Up Meaning

Example :   Stand up, then sit down again.1909, Archibald Marshall, The Squire's Daughter, chapterI:  He tried to persuade Cicely to stay away from the ball-room for a fourth dance. […] But she said she must go back, and when they joined the crowd again […] she found her mother standing up before the seat on which she had sat all the evening searching anxiously for her with her eyes, and her father by her side.  Laura stood the sofa up on end.  John stood Laura up at the movie theater.2008 Oct. 20, Jeph Jacques, Questionable Content 1255: Consummate:  â€” What?! Why did you come HERE then? You should be at a hospital!  â€” A gentleman never stands a lady up.1969 May 23, "Planetary Exploration: Doubleheader on Venus," Time:  Both Venus 5 and Venus 6 had apparently stood up well under the rigors of their 217-million-mile trips.1974 Dec. 23, "Watergate: Getting Out What Truth?," Time:  Ehrlichman's story did not stand up under Neal's grilling.2011 September 28, Tom Rostance, “Arsenal 2-1 Olympiakos”, BBC Sport:  It was a dreadful goal to concede as Ariel Ibagaza was able to take a short corner and then receive the return ball in space on the left. He stood up a floated cross into the middle where Fuster arrived unmarked to steer a header into the corner.