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.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
References in periodicals archive ?
Now that they can be properly called, let's hope that they won't flunk out of the police squad like former dog-in-training Gavel.
Student Lindbergh's grades almost spelled "flunk out." Lindbergh was teetering between a "C" and a "D" in Hyland's machine design course.
As well, he notes, the clinic serves clients who have no family doctor or who "flunk out of the province's strict Nova Scotia Drug Dependency methadone program."