English Usage - alibi.

The word alibi, which in Latin means ‘elsewhere’, has been used since the 18th century to mean ‘an assertion by a person that he or she was elsewhere’. In the 20th century a new meaning arose, originally in the US, of ‘an excuse’. This is a fairly common and natural extension of the core meaning, but, though widely accepted in standard English, it is still regarded as incorrect by some people.
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