flunk out

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 (flŭngk) Informal
v. flunked, flunk·ing, flunks
To fail, especially in a course or an examination.
a. To fail (an examination or course).
b. To give a failing grade to (a student).
2. To fail (a drug test, as for a performance enhancing substance).
1. A failure.
2. A failing grade.
Phrasal Verb:
flunk out
To expel or be expelled from a school or course because of work that does not meet required standards.

[Origin unknown.]

flunk′er n.
References in periodicals archive ?
Told that most of his classmates would flunk out, he quickly rose to the top.
Unfortunately, Max is about to flunk out because he spends more time on extracurricular activities than he does studying for classes.
CHICAGO--(BUSINESS WIRE)--May 29, 1996--When it comes to appropriate insurance coverage, most home-based businesses flunk out.