Meaning of “bygone” in the English Dictionary

"bygone" in British English

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bygoneadjective [ before noun ]

uk /ˈbaɪ.ɡɒn/ us /ˈbaɪ.ɡɑːn/

bygonenoun [ plural ]

uk /ˈbaɪ.ɡɒn/ us /ˈbaɪ.ɡɑːn/
let bygones be bygones

used to tell someone that they should forget about unpleasant things that happened in the past, and especially to forgive and forget something bad that someone has done to them :

Just let bygones be bygones and be friends again.

(Definition of “bygone” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"bygone" in American English

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bygoneadjective [ not gradable ]

us /ˈbɑɪˌɡɔn/

belonging to or happening in a past time:

The empty factories are relics of a bygone era.

(Definition of “bygone” from the Cambridge Academic Content Dictionary © Cambridge University Press)