What does the word upset mean?

Usage examples for upset

  1. He'd think I had come for money, and it would upset him for the day. – A Duet by A. Conan Doyle
  2. You will tell me what it was that you told Aunt Pike that upset her so? – Kitty Trenire by Mabel Quiller-Couch
  3. " Yes, and- er- she was so much upset," George went on, " that she's- well- the fact is, they can't come back, John, because she's let their room." – Poor Relations by Compton Mackenzie