Past tense of foss (an archaic verb); to ditch, trench, or fortify with a moat.
From foss, the verb form derived directly from fossa, with the regular past tense -ed ending. Archaic usage reflecting medieval fortification practices.
When medieval engineers fossed a castle site, they weren't just digging holes—they were calculating water flow, angle of attack, and sight lines simultaneously, combining geology, geometry, and strategy!
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