English Dictionary
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to become mentally ill
to start behaving in a dangerous uncontrolled manner
He went mad and tried to attack someone.
to become extremely excited and happy
The waiting crowd went mad when she stepped out of the car.
to become crazy because you are so bored, upset etc
I would go mad if I had to stay in bed for three weeks.
to do something that is not very sensible or wise
I went a bit mad after I'd got paid and bought some new clothes.
to become extremely angry
Dad went mad when he saw what I'd done to the car.