noun

• A device that has a helical function.
  "It is never possible to settle down to the ordinary routine of life at sea until the screw begins to revolve. There is an hour or two, after the passengers have embarked, which is disquieting and fussy."
• (slang, derogatory) A prison guard.
  "The screws moved her out of my cell because they could not stand the idea of a black and white white being together."
• (slang, derogatory) An extortioner; a sharp bargainer; a skinflint.
  "This gentleman and the guard seemed to know Sir Pitt very well, and laughed at him a great deal. They both agreed in calling him an old screw; which means a very stingy, avaricious person."
• (US, slang, dated) An instructor who examines with great or unnecessary severity; also, a searching or strict examination of a student by an instructor.

verb

• (transitive) To connect or assemble pieces using a screw.
• (ambitransitive, vulgar, slang) To have sexual intercourse with.
  "Somebody told me [...] that she [...] acknowledged to him [...] that Nero [...] had screwed her (meaning had carnal intercourse with plaintiff) up stairs the night before."
• (transitive, slang) To cheat someone or ruin their chances in a game or other situation.
• (transitive) To extort or practice extortion upon; to oppress by unreasonable or extortionate exactions; to put the screws on.
  "[…] our country landlords, by unmeasurable screwing and racking their tenants, have already reduced the miserable people to a worse condition than the peasants in France, or the vassals in Germany and Poland […]"