alibi (
http://definr.com/alibi)
n 1: (law) a defense by an accused person purporting to show that
he or she could not have committed the crime in question
2: a defense of some offensive behavior or some failure to keep
a promise etc.; "he kept finding excuses to stay"; "every
day he had a new alibi for not getting a job"; "his
transparent self-justification was unacceptable" [syn:
excuse,
self-justification]
v : exonerate by means of an alibi