n. & v.
n. 1 a claim, or the evidence supporting it, that when an alleged act took place one was elsewhere. 2 disp. an excuse of any kind; a pretext or justification.
v. (alibis, alibied, alibiing) colloq. 1 tr. provide an alibi or offer an excuse for (a person). 2 intr. provide an alibi.
[ L, = elsewhere ]