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cold day in Hell▼(an event that will never happen)noun[UK: kəʊld deɪ ɪn hel] [US: koʊld ˈdeɪ ɪn ˈhel]
when pigs fly▼(never, expressed by an idiom)adverb[UK: wen pɪɡz flaɪ] [US: hwen ˈpɪɡz ˈflaɪ]
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