by·gone /ˈbaɪˌgɔn ||ˌgɑn/
 過去的事,往事(a.)過去的


 By·gone a. Past; gone by. “Bygone fooleries.”


 By·gone n. Something gone by or past; a past event. “Let old bygones be”
 Let bygones be bygones, let the past be forgotten.

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 bygone
      adj : well in the past; former; "bygone days"; "dreams of foregone
            times"; "sweet memories of gone summers"; "relics of a
            departed era" [syn: bypast, departed, foregone, gone]
      n : past events to be put aside; "let bygones be bygones" [syn:
          water under the bridge]