Sam and Dave
1. slang Two or more police officers; the police collectively. Primarily heard in US. For days after the robbery, I was expecting Sam and Dave to come bust down our door and take us away in handcuffs.
2. slang A grave. The term originated in rhyming slang. Primarily heard in UK. They'll be digging him a Sam and Dave if he doesn't keep his nose out of the mob's business.
Sam and Dave
n. the police; police officers. (Black.) And there at the door were my old buddies Sam and Dave with a warrant.