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be (as) mad as a hatter

1. To be crazy. Tim has been behaving very erratically lately, so I'm afraid that he's as mad as a hatter.
2. To be very angry. Mom was mad as a hatter after I dented her brand-new car.
See also: hatter, mad

*mad as a hatter

 and *mad as a march hare 
1. crazy. (Alludes to the crazy characters in Lewis Carroll's Alice's Adventures in Wonderland. *Also: as ~.) Poor old John is as mad as a hatter. All these screaming children are driving me mad as a hatter.
2. angry. (This is a misunderstanding of mad in the first sense. *Also: as ~.) You make me so angry! I'm as mad as a hatter. John can't control his temper. He's always mad as a hatter.
See also: hatter, mad

mad as a hatter

Also, mad as a March hare. Crazy, demented, as in She is throwing out all his clothes; she's mad as a hatter. This expression, dating from the early 1800s, alludes to exposure to the chemicals formerly used in making felt hats, which caused tremors and other nervous symptoms. The variant, dating from the 14th century, alludes to the crazy behavior of hares during rutting season, mistakenly thought to be only in March.
See also: hatter, mad

mad as a hatter

mainly BRITISH
If someone is as mad as a hatter, they are crazy. Her sister's as mad as a hatter and if you ask me she's not much better herself. Note: In the 19th century, `hatters' or hat-makers used nitrate of mercury to treat their fabrics. This substance is poisonous, and if the hat-makers breathed it in, they often suffered brain damage. As a result, hatters were traditionally thought of as mad. In Lewis Carroll's children's story `Alice in Wonderland' (1865), one of the characters is a hatter who behaves very strangely. Carroll may have based the character on a well-known Oxford furniture dealer, Theophilus Carter, who was known as the `Mad Hatter'.
See also: hatter, mad

mad as a hatter (or a March hare)

completely crazy. informal
In this expression, a hatter refers to Lewis Carroll's character, the Mad Hatter, in Alice's Adventures in Wonderland ( 1865 ). It is thought that hatters suffered from the effects of mercury poisoning because of the fumes arising from the use of mercurous nitrate in the manufacture of felt hats. The March hare version refers to the way hares leap about during the breeding season.
See also: hatter, mad

(as) mad as a ˈhatter

(informal) (of a person) crazyThe Mad Hatter was a character in Lewis Carroll’s Alice’s Adventures in Wonderland. Because of the chemicals used in hat-making, workers often suffered from mercury poisoning, which can cause loss of memory and damage to the nervous system.
See also: hatter, mad

mad as a hatter

Crazy. The standard explanation comes from the effect to the brain caused by mercury nitrate used by 18th- and 19th-century hatmakers. Another view holds that “mad” originally meant “poisonous” and “hatter” is a corruption of the Saxon word “atter,” the adder snake, the bite of which affects the brain. In any event, the Mad Hatter character in Lewis Carroll's Alice in Wonderland is a testimony to eccentricity bordering on madness.
See also: hatter, mad
References in periodicals archive ?
But the Hatters held on for victory after they had dominated the first half.
Big home fixtures include their last game of the season in March when they face Rhondda Rebels, who will be competing in Europe this season, and league winners Sheffield Hatters on December 1.
Members of the Ambion Bonsai Club will now be holding monthly meetings at the Hatters Space Community Centre, in Upper Abbey Street, Nuneaton.
Portsmouth midfielder Marc Wilson could make his debut for the Hatters after joining the club on a short-term loan deal.
Red Hatters have strong, powerful voices," says Debra Granich, CEO of the Red Hat Society.
Hatters Space Learndirect Centre offers qualifications in English, maths and computing.
Captain Kevin Nicholls gave The Hatters the lead from the penalty spot after Rowan Vine was tripped in the box by Richard Wood.
January 7 v Manchester Mystics (a), 14 TBC, 21 v Sheffield Hatters Under-20 (a), 28 v Nottingham Wildcats (a).
Ladies Knockout Cup final: Carlylian Breakaways 271 (59, 53, 44, 64, 51), J Hoyle 29, D Hinton 28, Mad Hatters 284 (61, 54, 52, 60, 57), Z Mortimore 28, L Lock 27.
In injury-time, Craddock broke clear for Luton, but was denied by a fine block by Burch meaning the Hatters could be relegated on Monday if results do not go their way.
PHOTO (1--2--color) Above, Gertrude Gibson, 87, left, and Elizabeth Janiszewski, 70, of the Mad Hatters crochet hats for children's charities at the Moorpark Senior Center on Monday, while Barbara Withers, at left, crochets a green cap to be donated.
The half-time interval seemed to do the home side good and the Hatters came out with greater purpose at the start of the second period.
The Hatters are away to Nottingham Wildcats tonight.
But after a dramatic week which has seen the new owners sack boss Joe Kinnear and assistant Mick Harford both Terrell and Power have called an end to their involvement with the Hatters.
The Hatters set the early pace as the Rebels stuttered in the opening minutes and trailed by as much as 13 points in the opening quarter.