Past tense of fellow; united with or treated as an equal fellow; or paired with a companion.
From the base word 'fellow' converted to verb form with the '-ed' past tense suffix. This verb form is quite rare, but appears in literary contexts meaning to associate with or treat as an equal.
Though rarely used today, 'to fellow someone' meant to treat them as your equal—and 'he fellowed with the prince' would be a poetic way to say he was accepted into the royal circle!
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