sandbagging
n.— «NASCAR’s Cup teams will begin testing at the Daytona International Speedway for the upcoming season. Though they might not all reach full speed in testing (a practice known as “sandbagging”), we will know more about where every team stands.» —“Some six days to go” by Éric Descarries Auto123.com Jan. 2, 2008. (source: Double-Tongued Dictionary)