alibi:1

noun
al*i*bi \ ˈa-lə-ˌbī \
1731{ds||1||}
  • the plea of having been at the time of the commission of an act elsewhere than at the place of commission; also : the fact or state of having been elsewhere at the time
  • an excuse usually intended to avert blame or punishment (as for failure or negligence)
  • someone or something that provides a person with an alibi

alibi:2

verb
alibi \
1909{ds|t|||}
  • to exonerate (someone) by an alibi : to furnish an excuse for
  • to offer an excuse

alibi witness

noun
alibi witness \
1774
  • a witness upon whom a criminal defendant relies in establishing or providing an alibi
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