1 American English informal
when someone gets money from another person by using threats:
a Mafia shakedown
2 American English informal
a thorough search of a place or a person:
No weapons were found during the shakedown.
a period of time when people start to get used to a new arrangement and it becomes more effective
a period of time when prices are falling on a financial market
a final test of a boat, plane etc before it is put into general use:
The new system is in its shakedown phase.
the final situation, after a lot of other things have happened