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Plain and boring. Possibly offensive if used in reference to a certain class of white people. Used before a noun. We need to swap out your white-bread wardrobe for something a lot more confident.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
mod. plain; dull. If I wanted a white bread vacation, I’d have gone to the beach.
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.