Past tense of careen: tilted a ship on its side for cleaning and repair, or moved at high speed in an uncontrolled manner.
From Middle French carener, ultimately from Latin carina (keel). The sense of 'moving rapidly and uncontrollably' is a metaphorical extension from the 17th-18th centuries.
English pirates and privateers careened their ships in hidden Caribbean coves—the practice was so essential that naval power basically depended on finding secret careening spots where enemy fleets couldn't find you!
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