Copperhead (noun)

1. A venomous snake native to North America, characterized by copper-colored markings on its head.
2. A person who opposes the government during times of war or conflict, especially during the American Civil War, where the term was used to describe those who opposed the Union cause.

Origin:

Derived from the distinctive copper-colored markings on the heads of some species of the north american pit viper (agkistrodon contortrix) snake.

Examples:

1. The copperhead snake is known to be aggressive and dangerous.
2. During the American Civil War, the Copperheads were seen as traitors by the supporters of the Union.
3. The copperhead is known for its distinctive copper-colored head.
4. The copperhead was hiding in the tall grass and struck when I tried to step over it.
5. Copperheads were the most dangerous snakes encountered by the early settlers of North America.