To talk rapidly and foolishly; to chatter or babble without making much sense; to blather.
From Scottish or Northern English dialect, possibly related to 'blather' (to talk at length about nothing important). The '-er' ending emphasizes the continuous action.
Regional dialects like Scottish English have some of the most expressive words for nonsense-talking—'blither,' 'blather,' 'blether'—showing how different regions develop their own colorful vocabulary for the same concept!
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