1823, American English college slang, original meaning "to back out, give up, fail," of obscure origin, traditionally said to be an alteration of British university slang funk "to be frightened, shrink from" (see funk (n.1)). Meaning "cause to fail, give a failing mark to" is from 1843. Related: Flunked; flunking.
例文
1. He didn 't flunk out,but his record isn 't so hot.
彼は不合格ではなかったが、成績は普通だった。
2.Of course there are some who flunk this life too commonplace to be worthwhile.
自然であり、この平凡さを軽蔑しない人もいる。
漢英文学-中国現代小説から
3.Because of the laziness,the boy was flunk in the exam.
怠惰のため、この男の子は試験に不合格だった。
4.Mr Romney 's fans are typically people who did not flunk algebra.
ロムニー氏の支持者たちは典型的な代数不合格者だ。
5.If flunk out I can always transfer to Engineering.