Translation/Meaning of "have unaccountably neglected to return to sb" — Japanese-English & English-Japanese Translation Dictionary

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have unaccountably neglected to return to sb: どうしたわけか（人に）返さずじまいだったらしいセイヤーズ著浅羽莢子訳『殺人は広告する』(Murder must Advertise ) p. 102