copper-bottomed

Language: en

1.
British EnglishIrish EnglishAustralian Englishalso used in American Englishinformalcolloquialemphatic
- Figuratively certain, reliable, or foolproof; guaranteed to be sound or effective.
- Describing a plan, claim, or person presented as thoroughly secure, trustworthy, or beyond reasonable doubt.
2.
Global Englishneutraldescriptive
- Having a bottom made of copper, especially applied literally to vessels, cookware, or the hulls of ships.

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