Definition of "copper-bottomed" [cop•per-bot•tomed]

• Having lower parts made of or covered by copper (especially of a ship or cookware). (adjective)
• Thoroughly reliable. (adjective)

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• "The Financial Services Authority has toughened up its rules in the wake of the credit crunch, which claimed high-risk lenders such as Northern Rock and Bradford & Bingley, and is keen to make sure any new entrant is copper-bottomed."
• "It was the Glister, a smart little brig, almost a toy brig in fact, copper-bottomed, lines like a dolphin, a sea-cutter and a wind-eater."
• "She has led much of the recent research that has started to give some copper-bottomed scientific credibility to certain self-help techniques while casting doubt on others."