flunk out (flunking,flunked,flunks)

• 1.  

  PHRASAL VERB（动词词组） If you flunk out, you are dismissed from a school or college because your grades are not satisfactory. (因成绩太差) 被退学 [美国英语][非正式]

  例：

  He flunked out, a school official told CNN.

  一位校方官员告诉美国有线电视新闻网说，他被退学了。