It was fast, and there was no answer to her Knuckling.
"At Sunwich Port, Complete"
W.W. Jacobs
He returned to his view from the window, and was hating it with all his heart when a stout Knuckling on his door announced his callers.
"Alias The Lone Wolf"
Louis Joseph Vance
"Pardon, sir," he said, Knuckling, "but I followed you."
"Richard Carvel, Volume 5"
Winston Churchill