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Most people who try to lose weight fail dismally.
They have failed to come up with any practical solutions.
He failed in his attempt to get compensation.
He failed to come home at the usual time.
The government is failing in its duty to protect people.
The new plane failed a safety test.
She failed all her exams.
I failed on the written part of my driving test.
The brakes failed and the van crashed into a tree.
This is the British English definition of fail. View American English definition of fail.