Having been removed from a sheath; unsheathed or drawn (as a sword).
Past tense/participle of dissheathe + -ed. The past tense marker -ed follows regular English verb patterns established in Old English times.
Adding -ed to a verb serves double duty in English—it marks past tense AND creates adjectives ('a dissheathed sword' acts as an adjective describing the noun). This economy of form is a signature of English efficiency.
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