cold day in hell
極為罕見的事件或情況不太可能發生
口語·強調某事絕不可能發生
英文釋義
Something that is highly unlikely to happen
例句
It'll be a cold day in hell before I apologize to him for something I didn't do.
典故來源
源自基督教地獄火熱的傳統觀念,地獄變冷象征不可能發生的事,強調極端罕見。