flunk out


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flunk

 (flŭngk) Informal
v. flunked, flunk·ing, flunks
v.intr.
To fail, especially in a course or an examination.
v.tr.
1.
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).
n.
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.