What does the word sluice mean?

Usage examples for sluice

  1. It seemed nothing short of magic to watch the great gates slowly close, and then to feel their own boat rising slowly but steadily, as the water rushed in from the upper sluice. – The Dorrance Domain by Carolyn Wells
  2. Whenever I fell asleep, I awoke with the notion I had had in the sluice- house, that a long time had elapsed and the opportunity to save him was gone. – Great Expectations by Charles Dickens
  3. I want you to be careful not to sluice too long. – The Blazed Trail by Stewart Edward White