Thaw - The melting of ice or snow, or a relaxation of political harshness or hostility
Nixon fostered better relations with Brezhnev because he felt that a thaw in the hostility between the US and Russia would be better for both countries and the world.
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Thaw - (of ice, snow, or another frozen substance, such as food) become liquid or soft as a result of warming.
John's favorite time during his month's stay in Antarctica was when the ice began to thaw and the penguins played around his cabin.