• Simplified
  • Traditional
 
Idiom
as mad as a hatter
be barking mad
off one's rocker
off one's trolley
as nutty as a fruit cake
 
 
Meaning
completely crazy or deranged
 
 
Usage
They say the old man is constantly raving because he is as mad as a hatter.
 
 
Usage
You're playing tennis in this weather? You're barking mad!
 
 
Story
The expression as as mad as a hatter alludes to exposure to the chemicals formerly used in making felt hats, which caused tremors and other nervous symptoms.
 
 
成语
 
 
意思
 
 
应用
 
 
应用
 
 
故事
as mad as a hatter 使