An example from the WP article linked by user BalinKing:
> Some dialects of English make monophthongs from former diphthongs. For instance, Southern American English tends to realize the diphthong /aɪ/ as in eye as a long monophthong [äː], a feature known as /aj/ ungliding or /ay/ ungliding.
You know, where “I spy with my eye” from a (caricatured) Southerner becomes “Ah spah with mah ah”. What are diphthongs in most dialects of English have been turned into monophthongs.
