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English definition of “fault”

fault

noun [C] (CRACK)    /fɒlt/ US  /fɑːlt/ specialized
a crack in the Earth's surface where the rock has divided into two parts that move against each other: Surveyors say the fault line is capable of generating a major earthquake once in a hundred years.Caves, cracks and crevices
(Definition of fault noun (CRACK) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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