Someone or something that is near death, often an animal. That old horse can barely walk around the farm these days—he's just crow bait now.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
Rur. someone or an animal that is likely to die; a useless animal or person. That old dog used to hunt good, but now he's just crow bait.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.