From WordNet (r) 2.0 (August 2003) [wn]:
flunk
v : fail to get a passing grade; "She studied hard but failed
nevertheless"; "Did I fail the test?" [syn: fail,
bomb, flush it] [ant: pass]
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Flunk \Flunk\ (fl[u^][ng]k), v. i. [imp. & p. p. Flunked
(fl[u^][ng]kt); p. pr. & vb. n. Flunking.] [Cf. Funk.]
To fail, as on a lesson; to back out, as from an undertaking,
through fear.
[1913 Webster]
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Flunk \Flunk\, v. t.
1. To fail in; to fail to pass (a test, examination, or
course of study). [Colloq. U.S.]
[1913 Webster +PJC]
2. To shirk, as a task or duty.
[1913 Webster]
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Flunk \Flunk\, n.
A failure or backing out; specifically (College cant), a
total failure in a recitation. [U.S.]
[1913 Webster]