flunk out
phrasal verbflunk out (of something)
- (North American English, informal) to have to leave a school or college because your grades are not good enough
(因不及格而)离(校),给开除(学籍),退学 - He flunked out of college after four semesters.
四个学期后他因成绩差退学了。
- He flunked out of college after four semesters.