To tilt or sway while moving, as if out of control. The car careened around the corner, barely avoiding the oncoming traffic.
To move swiftly and in an uncontrolled way in a specified direction. The boat careened down the river, its passengers holding on tightly.
To cause a ship to lean over on one side for cleaning, caulking, or repair. The crew careened the ship to scrape off the barnacles from its hull.
(nautical, intransitive) Of a ship: to heel over or list to one side while underway or in heavy seas. The damaged schooner began to careen dangerously as the storm intensified.