Adjective bygone has 1 sense
  1. bygone, bypast, departed, foregone, gone - well in the past; former; "bygone days"; "dreams of foregone times"; "sweet memories of gone summers"; "relics of a departed era"
    Antonym: present (indirect, via future, past)
    Antonym: future (indirect, via past, present)
,Noun bygone has 1 sense
  1. bygone, water under the bridge - past events to be put aside; "let bygones be bygones"
    --1 is a kind of past, past times, yesteryear, yore
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