noun
reversal of a guilty verdict; acquittal on appeal
Legal term for overturning a conviction, typically through an appeal or retrial, resulting in a not-guilty verdict.
控訴審で逆転無罪を勝ち取った。
They won a reversal of the guilty verdict at the appellate court.
再審の結果、逆転無罪が確定した。
As a result of the retrial, the acquittal on appeal became final.
Compound of 逆転 (reversal) and 無罪 (innocence, not guilty). The term is a straightforward legal expression with no obscure historical derivation.