A diagonal line is straight and sloping, not horizontal or vertical, for example joining two opposite corners of a square or other flat shape with four sides:
Diagonalize
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to cross two or more intersecting streets in one direct [nonstop] path while avoiding contact with all [intermediate] [corners].
See hypotenuse-tionanal-ize.
Diagonalize meaning & definition 1 of Diagonalize.
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