A small potato or a term for potatoes in Scottish dialect; also a small, mischievous person.
From Scottish dialect, possibly related to brat (a scrap or small piece), with the -ie suffix creating a diminutive form commonly used in Scottish English.
Scottish miners called their lunch-pail potatoes 'bratties' because they were cheap, filling, and small enough to carry down into dark mines—it's a working-class food term that shows up in Lowland Scottish poetry.
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