An archaic or dialect form meaning to cover or mark with freckles; to cause freckles to appear.
From 'freck' plus the verb-forming suffix '-en' (Old English '-nian'). The '-en' suffix turns nouns and adjectives into verbs, seen in words like 'darken,' 'loosen,' and 'frighten'.
The '-en' suffix is ancient English magic—it transforms any noun into a verb describing what that thing does, which is why 'sun frecken' would mean 'the sun causes freckles,' though we'd say it differently today.
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