Definition of "Shakedown" :

noun: extortion of money (as by blackmail)

noun: a very thorough search of a person or a place

"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

"The new industry's economic shakedown."

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

"A shakedown cruise."