Definitions from Wiktionary (flunk)

▸ verb:  (US, ambitransitive) Of a student, to fail a class; to not pass.
▸ verb:  (US, transitive) Of a teacher, to deny a student a passing grade.
▸ verb:  (US, dated, informal) To shirk (a task or duty).
▸ verb:  To back out through fear. (Commonly in the phrase 'flunk it', the 'it' referring to a specific task avoided; sometimes without specific reference, describing a person's attitude to life in general.)
▸ Also see flunk

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