They approached at a shacking trot, which was more menacing than a gallop would have been-it was steady, inexorable, self-contained as a charge of cavalry.
"The Captain of the Gray-Horse Troop"
Hamlin Garland
I say, Morton, I don't know what you'll think of us shacking about in a public-house like this, and bringing you here, your first night, too!
"Mr. Marx's Secret"
E. Phillips Oppenheim