Flunk

v. i.	1.	To fail, as on a lesson; to back out, as from an undertaking, through fear. [imp. & p. p. Flunked (flŭņkt); p. pr. & vb. n. Flunking.]
v. t.	1.	To fail in; to fail to pass (a test, examination, or course of study).
	2.	To shirk, as a task or duty.
n.	1.	A failure or backing out

Verb

1.

flunk - fail to get a passing grade; "She studied hard but failed nevertheless"; "Did I fail the test?" Synonyms: flush it, bomb, fail

be found wanting, be unsuccessful, bollix, botch, bungle, bust, come to grief, fail, fail of success, fiasco, flunk out, foozle, go bankrupt, hash, labor in vain, lose, mess, muddle, not come off, not pass, not work, wash out, washout