so long Meaning in the Cambridge English Dictionary
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Meaning of “so long” in the English Dictionary

"so long" in British English

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so long

informal goodbye
(Definition of so long from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"so long" in American English

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so long

goodbye: So ​long, ​see you ​Thursday.
(Definition of so long from the Cambridge Academic Content Dictionary © Cambridge University Press)
Translations of “so long”
in Chinese (Simplified) 再会,再见…
in Chinese (Traditional) 再會,再見…