1. A frame-up; an arrest based upon incriminating evidence deliberately placed on the person or property of innocent or guilty. 2. A place where weapons, stolen goods, contraband, etc. are concealed. 3. An establishment for the production of illicit commodoties, as tax-evading whiskey, counterfeit labels or currency. 4. Any article, as a gun, counterfeit money, etc., used or placed in such a way as to incriminate an innocent person. 5. A plainclothesman or informer deliberately placed in a position to spy upon a suspect; a provocateur. 6. A place of concealement for fugitives, kidnap victims, etc. 7. A rendezvous of thieves, as a drinking place, apartment, or isolated shack. 8. An isolated place where gangland murders are committed, or where the bodies are concealed or otherwise disposed of. 9. A place marked to be robbed.

- american underworld dictionary - 1950