Having burrs; covered with or full of burrs (prickly seed cases); also describes a rolling pronunciation of the letter 'r'.
From burr plus the suffix -ed, describing something that is affected by burrs or makes a burring sound, as in Scottish rolled 'r' pronunciation.
A 'burred r' is how Scots and some Northern English people naturally pronounce 'r' by rolling it—it's not wrong, it's just a different feature of accent that has deep regional roots.
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