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long since
其昔/ 疾うに/ ずっと前に/ 夙に/ 疾っくに
of the distant or comparatively distant past
遠いか比較的遠い過去の
he has long since given up mountain climbing
彼はずっと前に登山をあきらめた
This name has long since been forgotten
この名前は忘れられて久しい