Source : Webster's Revised Unabridged Dictionary (1913)

Mishap \Mis*hap"\, n.
   Evil accident; ill luck; misfortune; mischance. --Chaucer.

         Secure from worldly chances and mishaps. --Shak.

Mishap \Mis*hap"\, v. i.
   To happen unluckily; -- used impersonally. [Obs.] ``If that
   me mishap.'' --Chaucer.

Source : WordNet®

mishap
     n 1: an unpredictable outcome that is unfortunate; "if I didn't
          have bad luck I wouldn't have any luck at all" [syn: {bad
          luck}, {mischance}]
     2: an instance of misfortune [syn: {misadventure}, {mischance}]

Source : Free On-Line Dictionary of Computing

MISHAP
     
        Early system on IBM 1103 or 1103A.  Listed in CACM 2(5):16,
        (May 1959).