What does the word windfall mean?

Usage examples for windfall

  1. Then he moved uneasily in his chair, cleared his throat huskily, and showed other signs of restlessness, all of which were hailed by Ezra Girdlestone as unmistakable proofs of the correctness of his judgment and of the not unnatural eagerness of the veteran on hearing of the windfall which chance had placed in his way. – The Firm of Girdlestone by Arthur Conan Doyle
  2. And there my sister became so excited by the twenty- five guineas, that nothing would serve her but we must have a dinner out of that windfall at the Blue Boar, and that Pumblechook must go over in his chaise- cart, and bring the Hubbles and Mr. Wopsle. – Great Expectations by Charles Dickens