dated slang A policeman, or the police in general. Round these parts, people tend to be as scared of Uncle nabs as they are of criminals. I thought someone was going to get killed until Uncle nab showed up and broke the fight up.
See also: uncle
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
n. a policeman. Watch out for Uncle nab. He’s been asking about you.
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.