Antonyms of burn:
cool, extinguish, put out, smother, stifle, subdue.
Examples of usage:
  1. " Then he ought to let his anger burn to some purpose.
    "A Singer from the Sea", Amelia Edith Huddleston Barr.
  2. If I look at it any more, I might burn it!
    "The Marriage of William Ashe", Mrs. Humphry Ward.
  3. Burn it and be quick about it!
    "The Bat", Avery Hopwood Mary Roberts Rinehart.