queue-busting
n.— «The company’s Micro Kiosks allow customers to check prices and can provide advertising and specific promotions. One Symbol portable product has let sales clerks at Apple stores ring up customers standing in line—a practice known as queue-busting.» —“In store for you: more convenience” by Keiko Morriss Newsday (Long Island, New York) Nov. 5, 2006. (source: Double-Tongued Dictionary)