Scottish/archaic: to direct, guide, or point someone in a particular direction.
From Old English eorðe (earth) via Scottish dialect, or possibly from a Scandinavian source meaning 'to guide.' The word is primarily Scottish and has been declining since medieval times.
The Scots word 'airt' appears in Robert Burns' poetry—it's part of a whole vocabulary for 'direction' that English speakers mostly lost, yet it's survived 500 years in Scottish communities, showing how dialects preserve old language.
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