Related Clues:

• Melt down
• Reduction in tension
• Turn slushy
• Prepare for cooking
• Ease, as hostilities
• Winter-to-spring transition
• Start to melt
• Become less icy
• Lose iciness
• Cold-War-to-detente transition
• Break the ice?
• Midwinter phenomenon, sometimes
• Defreeze
• Warm spell
• Opposite of freeze