Scottish and Northern English dialect word meaning to talk at length in a rambling or foolish way; also the person doing this talking.
From Old Norse 'blather' or similar Germanic roots meaning 'to make noise.' Scottish English preserved and developed this word while Southern English dropped it in favor of 'blather'.
Scottish people made 'blether' a fine art of words—meaning someone who talks a lot of nonsense. Robert Burns and other Scottish writers loved this word because it perfectly captures that person who goes on and on at parties!
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