flunk


Concise Oxford English Dictionary © 2008 Oxford University Press:
flunk/flʌŋk/
verb informal, chiefly N. Amer. fail to reach the required standard in (an examination).

■ (flunk out) be dismissed from school or college for failing examinations.

– origin C19: perh. rel. to funk1 or to US flink ‘be a coward’, perh. a var. of flinch.
'flunk' also found in these Oxford entries:

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