This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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verb-intransitive. To fail, especially in a course or an examination.

v. To fail (an examination or course).

v. To give a failing grade to.

n. The act or an instance of flunking.

n. 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.

v. Of a student, to fail a class; to not pass.

v. Of a teacher, to deny a student a passing grade.

verb-intransitive. To fail, as on a lesson; to back out, as from an undertaking, through fear.

v. To fail in; to fail to pass (a test, examination, or course of study).

v. To shirk, as a task or duty.

n. A failure or backing out.

To fail or give up; break down or back down, as from incompetence or fear: often with out: as, to flunk in a school recitation or examination; to flunk out from a contest.

To cause to fail, as in a recitation or an examination.

n. A failure or back-down; in colleges, a complete failure in a recitation or an examination.

v. fail to get a passing grade

n. failure to reach a minimum required performance

"And so we, lowly flunk from the salt mines, introduced our boss's boss (and others) to Mr Sinha."

flunked    flunking    flunks   

failure   

flunk out   

flunked    flunking   

fail    failure   

Funk    Monk    blunk    bunk    chunk    clunk    crunk    debunk    drunk    dunk