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Copperheadism

(US, historical) The state of being a Copperhead; sympathy in the North for Southern secessionists during the American Civil War.

ˈkɑpɚˌhɪdəmzDocumented since 1860sSilenthistorical323 viewsLast reviewed Jun 29, 2026+ Add a definition
🗺️ Regional & Other
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Born ~1860 · no dated citations yet
1860BornToday, 2026

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#1·Apr 27, 2026Global

(US, historical) The state of being a Copperhead; sympathy in the North for Southern secessionists during the American Civil War.

For parents

Copperheadism is a historical American political term referring to Northern Democrats who opposed the Civil War. Mostly used in historical and academic contexts. Not concerning. If your kid uses it constantly, ask them where they first heard it, not to police their speech but to understand which online community they are in. Most slang of this kind moves through TikTok and group chats, so seeing it in your child's vocabulary just means they are plugged into normal teen internet culture.

For ESL learners

Copperheadism is a historical American political term referring to the doctrine of Northern Democrats during the US Civil War who opposed the war and advocated for negotiated peace with the Confederacy. Use in historical and academic writing. Formal equivalent: "the Copperhead political faction." Common non-native mistake: confusing with the snake (also called copperhead). In political contexts the meaning is historical. Read or listen to the word in context several times before trying it yourself; the right register is harder to learn than the dictionary meaning.

Heard in the wild
  • “Republican prosecutors accused some prominent Copperheads of treason in a series of trials in 1864.[\[3\]](https://en.wikipedia.org/wiki/Copperhead_(politics)#cite_note-3) Copperheadism was a highly contentious [grassroots](https://en.wikipedia.org/wiki/Grassroots "Grassroots") movement.”

  • “Copperheadism was a highly contentious [grassroots](https://en.wikipedia.org/wiki/Grassroots "Grassroots") movement.”

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For specific readers

Copperheadism is a historical American political term referring to Northern Democrats who opposed the Civil War. Mostly used in historical and academic contexts. Not concerning. If your kid uses it constantly, ask them where they first heard it, not to police their speech but to understand which online community they are in. Most slang of this kind moves through TikTok and group chats, so seeing it in your child's vocabulary just means they are plugged into normal teen internet culture.

Why is this section here?

Slang is read by different audiences for very different reasons. The For parents view re-explains the term in plain, non-judgemental language so a caregiver can understand what their child means without needing the surrounding subculture. The For English learners view focuses on register (when it's safe to use), formal alternatives, and common mistakes — what a textbook won't teach you.

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Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.

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