alibi
Syllabification: (al·i·bi)
Pronunciation: /ˈaləˌbī/
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verb
[ with object] informal
Definition of alibi
noun ( plural alibis)
verb ( alibis, alibied, alibiing)
Origin:
late 17th century (as an adverb in the sense 'elsewhere'): from Latin, 'in another place; elsewhere'. The noun use dates from the late 18th century
The weakened nonlegal use of alibi to mean simply ‘an excuse’ is a fairly common and natural extension of the core meaning. It is acceptable in standard English, although regarded as incorrect by some traditionalists.