"bygone" in the noun sense
1. bygone, water under the bridge
past events to be put aside
"let bygones be bygones"
"bygone" in the adjective 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"
Source: WordNet® (An amazing lexical database of English)
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