a line or cut across a fabric that is not at right angles to a side of the fabric
辺に対し、直角でない直線
diagonal
an oblique line of squares of the same color on a checkerboard; "the bishop moves on the diagonals"
チェッカー盤の同じ色の正方形の斜線
diagonal
(mathematics) a set of entries in a square matrix running diagonally either from the upper left to lower right entry or running from the upper right to lower left entry