Scottish and Northern English dialect: mud, mire, slime, or any sticky, slimy substance; dirty or grimy matter.
From Old Norse or Germanic root related to slime/mud concepts. The word survived in Scottish dialect and likely relates to Proto-Germanic words for sticky or dirty substances.
Scottish 'glaur' is the perfect word for the specific texture of thick Scottish mud—so specific that it stuck around for a thousand years because English speakers needed it in the wet climate.
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