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English definition of “back in the day”

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back in the day

used for talking about a time in the past, usually when you are remembering nice things about that time: Back in the day, we had an apartment with a swimming pool.
Translations of “back in the day”
in Chinese (Traditional) 曾幾何時(尤用於追憶美好往事時)…
in Chinese (Simplified) 曾几何时(尤用于追忆美好往事时)…
(Definition of back in the day from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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