Longman Dictionary of Contemporary English
copper-bottomed
adjective
EXAMPLES FROM CORPUS
▪ This was not only copper-bottomed security, it was a chance to play with the big numbers and see what happened.
The Collaborative International Dictionary
Copper-bottomed
Copper-bottomed \Cop"per-bot`tomed\, a. Having a bottom made of copper, as a tin boiler or other vessel, or sheathed with copper, as a ship.
Wiktionary
copper-bottomed
a. 1 Having lower parts made of or covered by copper (especially of a ship or cookware). 2 (context British idiomatic English) Thoroughly reliable.
WordNet
copper-bottomed
adj. having a bottom of copper or sheathed with copper; "copper-bottomed pots"; "a copper-bottomed ship"
Usage examples of "copper-bottomed".
Yet well-founded though it was, his affection would not run to discussing the merits of different kinds of copper-bottomed tin-bodied well-kettles for an equal length of time.
Shave and clean shirt for six bells', followed by another set of orders and a sharp cutting pipe as the copper-bottomed launch, the honorary barge, was lowered down.