Synonym: bomb, fail, failing, flush it. Similar words: lung, lunar, lunch, chunk, skunk, trunk, plunge, plunder. Meaning: [flʌŋk] 
n. failure to reach a minimum required performance. v. fail to get a passing grade.
n. failure to reach a minimum required performance. v. fail to get a passing grade. 
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31. About 5 percent of students in the language program flunk out before their freshman year.
32. Mr Romney's fans are typically people who did not flunk algebra.
33. If you flunk finals you don't get the chance to do them again.
34. So, you'll like...flunk us if we don't change the world? -You might just squeak by with a C.
35. You mustn't flunk others , or you will be flunked out.
More similar words: lung, lunar, lunch, chunk, skunk, trunk, plunge, plunder, sunken, debunk, fall under, drunken, voluntary, volunteer, junk mail, fluid, flush, hunker down, fluffy, fluent, fluster, fluency, hunkered down, effluent, superfluity, influence, flustered, superfluous, fluctuate, influential.