careening

Careening comes from the French carène, meaning the keel of a ship, which itself derives from Latin carina, meaning keel or nutshell — both suggesting a curved, shell-like underside. The term described the operation of heaving a vessel over onto its side to expose the underwater hull for cleaning, caulking, and repair. A ship that needed careening was said to be 'on the careen.' The word entered English in the seventeenth century, and the operation it named was one of the most labor-intensive and strategically crucial maintenance procedures in the age of sail. A ship's speed, maneuverability, and longevity all depended on the cleanliness of its bottom.

In warm tropical waters, wooden hulls fouled with alarming speed. Barnacles attached within days of a ship leaving port; green weed followed, then toredo shipworms that bored through planks with industrial efficiency. A badly fouled ship might lose a quarter of her speed, becoming unable to run from an enemy or catch a merchant prize. In temperate northern waters the problem was slower but relentless; in the Caribbean and Indian Ocean it was urgent. Naval officers scheduled careening as a matter of operational necessity, timing it for periods of inactivity or in sheltered anchorages. A ship careening was a ship defenseless: guns might be removed to reduce weight, and the vessel lying on her side could neither sail nor fight.

The operation required precise seamanship. The ship was brought to a sheltered beach or careening wharf, her guns, stores, and ballast removed or shifted to reduce weight, and heavy tackles attached to her masts and run to a fixed point ashore or to another vessel. Then the tackles were hauled, pulling the mast toward the shore until the ship listed sharply, her underwater keel and planking rising into the open air. Gangs of men went over the exposed side with scrapers, oakum, tallow, and caulking irons, cleaning the marine growth and sealing any opened seams. When one side was done, the ship was righted and careened the other way.

The English word careen has developed a second, unrelated sense: to lurch or swerve at speed, as a car careens around a corner. This usage, common in American English, almost certainly derives from the visual image of a ship on the careen — heeled over at a steep angle, apparently on the verge of capsizing. The violent tilt of the careening ship became a metaphor for any dangerous, uncontrolled leaning motion. Etymologically careful writers note that 'careen' in the sense of lurching is disputed by some usage guides, who prefer 'career' for that sense; but careen has been used for tilting motion since the nineteenth century, and the confusion is itself a small etymological drama playing out in real time.