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To fall short of success or achievement in something expected, attempted, desired, or approved. The meaning of fail is to lose strength : The student received a fail on the final paper. Informal something that does not achieve the desired result; If none of our plans…. A failing grade: How to use fail in a sentence. To not succeed in what you are trying to achieve or are expected to do: Not pass, be unsuccessful, flunk [informal], screw up [informal] more synonyms of fail See examples of fail …