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English definition of “bygone”

bygone

adjective [before noun] uk   /ˈbaɪ.ɡɒn/ us    /-ɡɑːn/
belonging to or happening in a past time: a bygone eraIn the past

bygone

noun [plural] uk   /ˈbaɪ.ɡɒn/ us    /-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.Making and accepting apologies
(Definition of bygone from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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