Test run is a term used to describe a process of testing a product or system before it is released. The term can be broken down into three parts: TRIAL (5 letters), FEELER (6 letters), and Shakedowncruise (15 letters). A TRIAL is a test or experiment conducted to evaluate the performance of a product or system. A FEELER is an exploratory action taken to gauge the reaction of others. Finally, a shakedowncruise is a test voyage taken by a ship or aircraft to check its performance and make sure it is ready for service.