Meaning of copper-bottomed | Babel Free

Definitions

1. Having lower parts made of or covered by copper.
   especially
2. Thoroughly reliable; secure.
   British, idiomatic

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'.”

“The copper-bottomed angel at Messrs. Paff’s in Broadway.”

CEFR level