Neat, clean, and organized; in perfect order or condition.
From nautical terminology: 'ship' plus 'shape,' originating in the 1600s when naval discipline required ships to be kept in perfect order for safety and survival at sea.
On sailing ships, literally having everything 'in shape' meant the difference between life and death in a storm—a loose rope, a messy deck, or a poorly stowed cargo could capsize you, so 'shipshape' became synonymous with perfect order.
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