shake down

verb5

1. •
   To cause something to fall down by shaking it, or something it is attached to.

   • shake down apples from an apple tree.
2. •
   (slang) To extort money from (someone) by means of threats.

   • He left after shaking her down for four bits for carrying the bags. — 1966
3. •
   To shake someone so money falls from their pockets.
4. •
   To subject something to a shakedown test.
5. •
   (slang) To search exhaustively.