Copper-bottomed
adj ·Rare ·Advanced level
Definitions
- 1 Having lower parts made of or covered by copper. especially
"According to Robert Hulse, 'It's half worm, half mollusc, and there are more dead men at the bottom of the sea as a result of those things [shipworms] than all the naval battles put together. They're the reason you had copper-bottomed ships'."
- 2 Thoroughly reliable; secure. British, idiomatic
"The copper-bottomed angel at Messrs. Paff’s in Broadway."
- 1 having a bottom of copper or sheathed with copper wordnet
Synonyms
All synonymsExample
More examples"According to Robert Hulse, 'It's half worm, half mollusc, and there are more dead men at the bottom of the sea as a result of those things [shipworms] than all the naval battles put together. They're the reason you had copper-bottomed ships'."
Etymology
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. The British idiomatic use comes from the fact that with Britain being a major naval power, there was always a ready market for copper in ship construction, making it a reliable commodity to invest in.
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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.