Copperheadism
nounEtymology From Copperhead + -ism.
1
US, Historical The state of being a Copperhead; sympathy in the North for Southern secessionists during the American Civil War.
- The project went nowhere, but it did plant seeds of copperheadism that germinated a couple of years later.1988, James McPherson, Battle Cry of Freedom, Oxford, published 2003, page 247: