Third-person singular simple present indicative form of flunk.(verb)
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Use "flunks" in a sentence
"It is Mr. Goodale's review that "flunks," to borrow your language."
"If one were in a blue funk of dejection because of failure in a class, he would lend the sympathy that came from his own rich experience in failures, -- not only past but present, for some things that come easy at sixteen come hard at sixty-five, and this man who would accept no favors had to fight his way through "flunks" and "goose-eggs" like the younger members of the class."
"He knows that all too often it's their school system that flunks."