That morning, finding that I was to be involved in the horrid disappointment he had prepared for the mutineers, he had run all the way to the cave, and leaving the squire to guard the captain, had taken Gray and the maroon and started, making the diagonal across the island to be at hand beside the pine.
There are no more uses of "diagonal" in the book.
Show samples from other sources
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.