Definitions of shakedown:

• noun:   extortion of money (as by blackmail)
• noun:   a very thorough search of a person or a place

  Example: "A shakedown by the police uncovered the drugs"

• noun:   initial adjustments to improve the functioning or the efficiency and to bring to a more satisfactory state

  Example: "The new industry's economic shakedown"

• adjective:   intended to test a new system under operating conditions and to familiarize the operators with the system

  Example: "A shakedown cruise"