IdiomThe AbsurdEnglish

Mad as a hatter

Meaning: Completely eccentric or unhinged.

Example: “Our landlord talks to his tomato plants every morning; he's mad as a hatter, but harmless.”

Origin: 18th–19th-century hat-makers cured felt with mercury and suffered poisoning — tremors, slurred speech, erratic moods; the phrase predates Lewis Carroll's Hatter.

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