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English definition of “fail”

fail

verb [T] (NOT HELP)    /feɪl/
to not help someone when you are expected to do so: He failed her when she most needed him. When I looked down and saw how far I had to jump , my courage failed me (= I felt very frightened ).Disappointing yourself and others
(Definition of fail verb (NOT HELP) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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