Meaning : Initial adjustments to improve the functioning or the efficiency and to bring to a more satisfactory state.
Example :
The new industry's economic shakedown.
Meaning : A very thorough search of a person or a place.
Example :
A shakedown by the police uncovered the drugs.
Meaning : Extortion of money (as by blackmail).
Meaning : Intended to test a new system under operating conditions and to familiarize the operators with the system.
Example :
A shakedown cruise.