What does the word foil mean?

Usage examples for foil

  1. She was dressed entirely in black, and her sable figure made a startling foil to Diana's slender whiteness. – The Splendid Folly by Margaret Pedler
  2. They were quite aware of the uses to which the king was hoping to turn their reverence for the memory and the family of the great martyr, and were determined to foil such idle projects on the threshold. – Project Gutenberg History of The Netherlands, 1555-1623, Complete by John Lothrop Motley
  3. Then he suddenly spoke, and his voice was like a fencer's foil- light, bright, alert, constantly playing, yet utterly on guard. – The Moon is Green by Fritz Reuter Leiber