In a direction or manner that follows a diagonal line or pattern.
From diagonal plus the Old English -wise suffix meaning 'in the manner or direction of.' This is an archaic or technical formation combining two common word elements.
While 'diagonalwise' is rare in modern English, it follows the same pattern as 'clockwise' and 'lengthwise'—showing how English speakers can combine direction words with -wise to describe movement. It's like a linguistic tool kit where -wise is the universal adapter.
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