A temporary substitute for a bed, as one made on the floor or on chairs; -- perhaps originally from the shaking down of straw for this purpose.
- Slang Extortion of money, as by blackmail.
- Slang A thorough search of a place or person.
- A period of appraisal followed by adjustments to improve efficiency or functioning.
- Serving to test the performance of a ship or aircraft and to familiarize the crew with operation of the craft: a shakedown cruise; a shakedown flight.