When different regional accents and ways of speaking become more similar to each other over time. This happens as people from different areas interact more, like through moving to cities or through the influence of media. As a result, features of local accents and dialects might fade, and people start using a more common, neutral way of speaking. For example, different pronunciations, words, or grammar from different regions can gradually blend into something that's understood by more people, making regional dialects less distinct.