turncoat

[turn-koht]
noun
a person who changes to the opposite party or faction, reverses principles, etc.; renegade.

Origin:
1550–60; turn + coat

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World English Dictionary
turncoat (ˈtɜːnˌkəʊt)
 
n
a person who deserts one cause or party for the opposite faction; renegade

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

turncoat
1557, from turn + coat. Originally one who tried to hide the badge of his party or leader. The expression to turn one's coat "change principles or party" is recorded from 1565.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Mugwump thus became a term for a political turncoat.
Each, too, was accused of being a turncoat and evoked bitter political enmity.
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