Present participle of 'alibi': the act of providing an excuse or offering an alibi as a reason for not doing something or not being somewhere.
From the verb 'alibi,' with the '-ing' gerund/present participle suffix added, creating the continuous form of the action.
The verb form 'alibi' became common in American English in the early 1900s as crime fiction exploded in popularity, and lawyers and detectives needed a quick word for the excuse-making process.
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