An archaic plural or emphatic form meaning 'at former times' or 'sometimes' or 'occasionally.'
From 'erewhile' plus an additional '-s' suffix, creating an archaic adverbial form that appears in Middle English texts. The suffix usage suggests frequency or multiple occurrences across time.
'Erewhiles' is one of those delightfully archaic words that Samuel Butler might have used ironically—it's so thoroughly obsolete that using it now signals you're either reading very old texts or deliberately being playful with language.
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