What does the word quicksand mean?

Usage examples for quicksand

  1. Even had he thought enough about the matter to admit that certain untoward conditions might have to be met, he would have failed to realize that the shore towards which he was struggling might prove in the end a quicksand. – Flamsted quarries by Mary E. Waller
  2. The world is a quicksand. – Foul Play by Charles Reade Dion Boucicault
  3. Without a strong aversion to change its habits and, with its habits, the pabulum of its mind, there would be no fixity of type in any species and, indeed, there would be no life at all, as we are accustomed to think of life, for organs would disappear before they could be developed, and to try to build life on such a shifting foundation would be as hopeless as it would be to try and build a material building on an actual quicksand. – The Note-Books of Samuel Butler by Samuel Butler