An Irish or Celtic fairy mound or burial site, traditionally believed to be inhabited by supernatural beings or the Sidhe in Irish mythology.
From Old Irish 'brúg' meaning dwelling or house, related to the word for fairy fortress; the term appears in medieval Irish mythology texts like the Mythological Cycle.
In Irish mythology, a brugh wasn't just any hill—it was a liminal space where fairies could live 'under' human visibility, and crossing from the mortal world to the fairy realm took literally stepping into a brugh.
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