Copper-bottomed Definition
adjective
Having lower parts made of or covered by copper (especially of a ship or cookware).
Wiktionary
(UK, idiomatic) Thoroughly reliable.
Wiktionary
Origin of Copper-bottomed
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From the copper sheathing applied to the bottom of a wooden ship to prevent damage from marine organisms. In literal sense 18th century, in figurative sense attested since at least 1807.
From Wiktionary
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