(n) 1. The area in which criminals operate, especially when enjoying eminent domain there, either through police protection or by the right of might. 2. A successfully accomplished theft. 3. An escape from prison or custody. "Phil made a nice beat out of the bughouse (insane asylum)."

(n) 1. To escape; to run away. 2. To win a discharge or acquittal. 3. To rob. "They beat the sucker for a nice pocket-touch (proceeds of his pockets)."

Beat a joint, Beat a mark, Beat a rap, Beat a stir, Beat a stretch

- american underworld dictionary - 1950