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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.
She failed to give any explanation for her actions.
He failed to come home at the usual time.
The government is failing in its duty to protect people.
The new airplane failed a safety test.
She failed all her tests.
I failed on the written part of my driver's test.
The brakes failed and the van crashed into a tree.
This is the American English definition of fail. View British English definition of fail.