serried

The word 'serried' presents a compact history of military and physical density. It entered English in the 17th century from the French 'serré', meaning pressed or tight, which itself evolved from the Latin 'sera', a bolt or lock—an object that fastens things securely together. This etymological path moved from the concrete concept of a locking mechanism to the action of pressing or crowding, and finally settled as an adjective describing tightly packed formations, most famously of soldiers. Thus, the modern abstract sense of dense, unbroken ranks logically extends from the ancient idea of being bolted or fastened into a tight, impenetrable unit.

The word is a simplex form derived from the past participle of the now-obsolete English verb 'serry', meaning to press close together. 'Serry' itself was borrowed from the Middle French 'serré', the past participle of 'serrer' (to press, squeeze, clasp), which originated from the Vulgar Latin 'serrare', a derivative of the Latin 'sera' (a bar, bolt, lock).