shake down

shake down  {v. phr.}
1. To cause to fall by shaking.
He shook some pears down from the free.
2.  {informal}
To test, practice, get running smoothly (a ship or ship's crew).
The captain shook down his new ship on a voyage to the Mediterranean Sea.
3.  {slang}
To get money from by threats.
The gangsters shook the store owner down every month.
Categories: {informal} {slang} {v. phr.}