Scottish dialect meaning bristly, rough, or resembling birrs.
From 'birse' with the common Scottish '-y' suffix forming adjectives. Related to Old English 'byrst' meaning bristle.
Adding '-y' to create adjectives is one of the oldest tricks in English—'birsy' is basically saying 'like a birr' or 'full of birse,' and it's a natural word-building pattern humans use everywhere!
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