—n. 1. Law.the defense by an accused person of having been elsewhere at the time an alleged offense was committed.
2. an excuse, esp. to avoid blame.
3. a person used as one's excuse: My sick grandmother was my alibi for missing school.
—v.i. Informal.to give an excuse; offer a defense: to alibi for being late.
—v.t. Informal. a. to provide an alibi for (someone): He alibied his friend out of a fix. b. to make or find (one's way) by using alibis: to alibi one's way out of work.