What is "sand!"

Sand! is a 1920 American silent Western film directed by Lambert Hillyer and written by Lambert Hillyer based upon the Russell A. Boggs short story "Dan Kurrie’s Inning." The film stars William S. Hart, Mary Thurman, G. Raymond Nye, Patricia Palmer, Bill Patton, and S.J. Bingham. The film was released on June 20, 1920, by Paramount Pictures.