A person or ship that careens, or someone whose behavior or movement is reckless and rapidly changing direction.
From careen + -er (agent noun suffix). Created in the 1600s-1700s as maritime vocabulary expanded during the Age of Exploration and naval warfare.
A ship's careener was actually a specialized skilled worker—they knew exactly how far to tip the ship without capsizing it, and they could read tides and weather to predict the perfect careening moment.
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