Past events to be put aside:
— Let bygones be bygones.

synonym: water under the bridge.

Dutch: de dingen die voorbij zijn

Well in the past; former:
— Bygone days.

synonyms: bypast, departed, foregone, gone.

Roget 506: forgotten etc. v.; unremembered, past recollection, bygone, out of mind; buried in oblivion, sunk in oblivion; clean forgotten; gone out of one's head, gone out of one's recollection.    forgetful, oblivious, mindless, Lethean; insensible to the past etc. 823; heedless.    ... show more

Roget 122: past, gone, gone by, over, passed away, bygone, foregone; elapsed, lapsed, preterlapsed^†, expired, no more, run out, blown over, has-been, that has been, extinct, antediluvian, antebellum, never to return, gone with the wind, exploded, forgotten, irrecoverable; obsolete etc. (old) 124.    former, pristine, quondam, ci-devant [Fr.], late; ancestral.    foregoing; last, latter; recent, over night; preterperfect^†, preterpluperfect^†.    looking back etc. v.; retrospective, retroactive; archaeological etc. n.. ... show more

Polish: dawny, dawniejszy