a makeshift bed, e.g. one made up on the floor
NAmer an act or instance of shaking somebody down; esp extortion
NAmer a thorough search
NAmer a trial period or trial run intended to bring to light any faults in or problems with new equipment and to familiarize its users with it
(used before a noun) designed to test a new ship, aircraft, etc and allow the crew to become familiar with it
a shakedown cruise