Mad as a Hatter
Meaning: Completely crazy or very strange in behavior (informal and a little old-fashioned).
In English, saying someone is "mad as a hatter" means they're acting a little crazy. The phrase is often linked to 18th- and 19th-century hat makers, who used mercury in their work; mercury poisoning could cause strange behavior. English tip: in this phrase, "mad" means crazy, but in everyday American English, "mad" usually means angry. For example, "Are you mad at me?" means "Are you angry with me?"
How to use it
It’s a playful way to describe wild or eccentric behavior. Use it for funny, harmless habits, not about someone’s real mental illness, where it can sound unkind. Many people connect it with the Hatter in “Alice’s Adventures in Wonderland,” often called the Mad Hatter.
Examples
- My uncle keeps twelve parrots in his apartment. He’s mad as a hatter.
- Our neighbor talks to his tomatoes every morning. He’s as mad as a hatter, but he’s very kind.
- She wore shorts in the snow and said she was warm. Mad as a hatter.
A common mistake
Keep the article: (as) mad as a hatter, not “mad like hatter.” Also, in American English “mad” alone usually means angry, but in this phrase it means crazy.
Where it comes from
The most common explanation: hat makers in the 1700s and 1800s used mercury to make felt, and mercury poisoning caused shaking and strange behavior. That health problem was real, but no one can prove it is where the phrase came from. The phrase was already in use decades before Lewis Carroll’s Hatter appeared in 1865.
Say it out loud
Tabbi Daily gives you one short lesson like this every day. Listen, record yourself and hear how you sound. Free, no account needed.
Source: The Henry Ford