alibi - definition and synonyms

noun [countable] 

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/ˈælɪbaɪ/
singularalibi
pluralalibis
  1. 1
    someone who has an alibi can prove that they were somewhere else when a crime was committed and so can claim to be not guilty
    provide an alibi:

    His wife, of course, provided him with an alibi.

    a cast-iron alibi:

    Smith had a cast-iron alibi since he was in prison at the time of the crime.

  2. 2
    an excuse for not having done something that you should have done