Definition of flunk out phrasal verb from the Oxford Advanced Learner's Dictionary

 

flunk out

 phrasal verb
phrasal verb
 
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Phrasal Verbs

flunk out (of something)

 
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(North American English, informal) to have to leave a school or college because your marks/grades are not good enough He flunked out of college after four semesters.
See the Oxford Advanced American Dictionary entry: flunk out