What does the word curdle mean?

Usage examples for curdle

  1. Instantly a loud, unearthly laugh rang through the room, causing the blood to curdle about his heart. – The Lights and Shadows of Real Life by T.S. Arthur Edition: 10 Language: English
  2. Why should the discovery of its existence curdle my blood, stop my heart- beats, and send a rush of burning shame from forehead to finger- tip? – Half a Century by Jane Grey Cannon Swisshelm