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slang A spineless, cowardly person. Oh, don't be such a yellow-belly, Tom. You'll never get ahead in this industry if you're not willing to take risks! Nothing's going to change unless those yellow-bellies up in Washington are willing to stand up to the corporate lobbyists trying to pull the strings.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
n. a coward. Tell the yellow-belly to come outside and say that.
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.