- fail [fāl]vi.[ME failen < OFr faillir, to fail, miss < L fallere, to deceive, disappoint < IE base * ĝhwel-, to bend, deviate > Sans hválati, (he) loses the way, errs, Gr phēloein, to deceive]1. to be lacking or insufficient; fall short [the water supply is failing]2. to lose power or strength; weaken; die away3. to stop operating or working [the brakes failed]4. to be deficient or negligent in an obligation, duty, or expectation; default5. to be unsuccessful in obtaining a desired end; be unable to do or become; miss6. to become bankrupt7. Educ. to get a grade of failure; not passvt.1. to be useless or not helpful to; be inadequate for; disappoint2. to leave; abandon [his courage failed him]3. to miss, neglect, or omit: used with an infinitive [he failed to go]4. Educ.a) to give a grade of failure to (a pupil)b) to get a grade of failure in (a subject)n.[ME faile < OFr faile < the v.]failure: now only in the phrase without fail, without failing (to occur, do something, etc.)——————fail ofto fail to achieve; be without
English World dictionary. V. Neufeldt. 2014.