turncoat
turn·coat
noun
Origin
A compound of turn + coat, reportedly derived from the sometime military practice of wearing uniform coats that were lined in material of a contrasting color, and which could be worn inside out to present a different appearance.
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Broader terms
WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.