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English definition of “once upon a time”

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once upon a time

B1 used at the beginning of children's stories to mean "a long time ago": Once upon a time there was an ugly duckling. used when referring to something that happened in the past, especially when showing that you feel sorry that it no longer happens: Once upon a time people knew the difference between right and wrong, but nowadays nobody seems to care.
(Definition of once upon a time from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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