slantwise

Etymology

slant + -wise

adj

1. diagonal, in a direction or orientation between cardinal axes
   I can see it all now,—the slantwise rain / Of light through the leaves, / The sundown's blaze on her window-pane, / The bloom of her roses under the eaves. 1858, John Greenleaf Whittier, "Telling the Bees" in The Works of John Greenleaf Whittier, Vol. I, Narrative and Legendary Poems, http://www.gutenberg.org/files/9567/9567-h/9567-h.htm#link2H_4_0045

adv

1. diagonally, in a direction or orientation between cardinal axes
   […] he had received a cut slantwise along one temple and cheek, leaving a long scar like a streak of dawn's light falling athwart the dark visage. 1924, Herman Melville, chapter 8, in Billy Budd, London: Constable & Co.
   Slantwise, a salamander-shaped sea came at them, growing. 1970, Larry Niven, Ringworld, page 113