The act or process of losing a distinctive way of speaking particular to a certain region or group.

बोली खो जाना

English Usage: The loss of accent made it difficult to determine his regional background.

Hindi Usage: उच्चारण की हानि के कारण उसके क्षेत्रीय पृष्ठभूमि का निर्धारण मुश्किल हो गया।