Fitted or equipped with a 'cat' (a device used on sailing ships to lift an anchor), or rigged in a particular cat-related way.
From 'cat' (a nautical device, possibly from Dutch 'kat') plus 'rigged' (from Old Norse 'reif' meaning rope); nautical terminology from the age of sailing ships.
Ship terminology is absolutely packed with mysterious animal names—'catrigged,' 'ratlines,' 'dogwatch'—and sailors' dark humor meant some of these terms had pretty unpleasant original meanings!
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