Alibi

Alibi as a noun is defined as a defense to a criminal charge alleging that the accused was somewhere other than at the scene of the crime at the time it occurred. 

• For example, A could not confirm B’s alibi that B was at the dentist office at the time of the robbery.

Alibi as a verb is used when a person provides an alibi for someone. 

• For example, A’s dentist is A’s alibi: they were at their appointment at the time of the robbery.

See, e.g. Lee v. Kemna, 534 U.S. 362 (2002)

See also Alibi witness Criminal law