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English definition of “fail”

fail

noun [C]     /feɪl/
without fail If you do something without fail, you always do it: I go to the gym every Monday and Wednesday, without fail.Always and never used to tell someone that they must do something: Be there at nine o'clock, without fail.Duty, obligation and responsibility
(Definition of fail noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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