In the corner diagonally opposite the door Mrs. Higgins, now over sixty and long past taking the trouble to dress out of the fashion, sits writing at an elegantly simple writing-table with a bell button within reach of her hand.
There are no more uses of "diagonal" in the play.
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The artist used diagonal lines to create tension.
A pink scar started under his right eye, hit the corner of his nose, and ran diagonally across his upper lip.