Synonyms to back when

ago, antiquated, antique, back, backward, blown over, by, bygone, bypast, dated, dead, dead and buried, deceased, defunct, departed, elapsed, expired, extinct, finished, forgotten, gone, gone by, gone glimmering, gone-by, has-been, into the past, irrecoverable, lapsed, no more, obsolete, over, passe, passed, passed away, past, reminiscently, retroactively, retrospectively, run out, since, vanished, wound up, a priori, a rebours, a reculons, abandon, abet, accented, acknowledgments, advance, advocate, affirm, afford support, aft, after, aftermost, afterpart, afterpiece, again, against the grain, aid, alpenstock, alveolar, alveolar ridge, alveolus, angel, ante, ante up, anticlockwise, apex, apical, apico-alveolar, apico-dental, arear, arena, arm, around, arrested, articulated, arytenoid cartilages, ascend, ascender, ascending, aside, ass-backwards, assimilated, assist, assure, astern, athletic supporter, attest, authenticate, away, axial, back away, back door, back matter, back of beyond, back off, back seat, back side, back up, back-country, back-flowing, backbone, backdrop, background