redoubt
plural of downcall
past participle of break even
(rare) To doubt again.
(mathematics) A hyperbolic quadrilateral whose two gyrodiagonals intersect at their gyromidpoints, analogous to a parallelogram in Euclidean space.
報告書に矛盾が見つかったため、彼女は以前の結論を改めて疑わざるを得なかった。
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