shake down v.
1. in senses of shakedown n. (1)
(a) [mid-19C+] to sleep in an impromptu bed.
(b) [late 19C] to settle into living quarters.
2. (also shake loose, shake out) in senses of shakedown n. (4)
(a) [mid-19C+] to blackmail, to extort money (from); thus shaker-down n., a blackmailer.
(b) [late 19C+] to interrogate; to elicit information.
(c) [late 19C–1910s] to obtain a financial contribution from, e.g. to a political campaign.
(d) [20C+] (also shake, of (usu.) police, to search, to raid; also (prison) to search a cell.
(e) [1910s] to check one’s pockets (for cash).
(f) [1910s] to pay protection to the police against one’s will.
(g) [1930s+] to rob.
(h) [1950s] to empty out.
(i) [1990s+] (US black) to have sex with.
3. [1990s+] to beat at cards.
[2000s] to make an effort, to get to work.