fail
verb
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get worseslip
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stop operating or functioningbreak
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prove insufficient“The water supply for the town failed after a long drought”run out
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disappoint, prove undependable tobetray
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become bankrupt or insolvent“fail financially and close”
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fall short in what is expected“They failed to meet their obligations.”
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fail to get a passing grade“They studied hard but failed nevertheless.”flunk
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judge unacceptable“The teacher failed six students”
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be unsuccessful“Where do today's public schools fail?”miscarry
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fail to do somethingneglect
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be unable“I fail to understand your motives”