An archaic or dialectal past participle meaning frozen or turned to ice.
From Old English 'froren,' the past participle of 'freosan' (to freeze). This form evolved from Proto-Germanic *freusan- and is related to modern 'frozen,' but represents an older grammatical ending that fell out of standard use.
English used to have many more verb forms like this—'froren' shows how our language had richer inflections centuries ago. Most of these old forms disappeared as English simplified its grammar over time, which is why we say 'frozen' today instead.
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