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Webster's 1828 Dictionary

COPPER-BOTTOMED

a.Having a bottom sheathed with copper.

 

Webster's 1913 Dictionary

COPPER-BOTTOMED

COPPER-BOTTOMED Cop "per-bot `tomed, a.

 

Defn: Having a bottom made of copper, as a tin boiler or other vessel, or sheathed with copper, as a ship.

 

New American Oxford Dictionary

copper-bottomed

copper-bottomed ▶adjective Brit. thoroughly reliable; certain not to fail: a copper-bottomed guarantee. [from earlier usage referring to the copper sheathing of the bottom of a ship. ]

 

Oxford Dictionary

copper-bottomed

copper-bottomed ▶adjective Brit. thoroughly reliable; certain not to fail: a copper-bottomed guarantee. [from earlier usage referring to the copper sheathing of the bottom of a ship. ]

 

Sanseido Wisdom Dictionary

copper-bottomed

c ò pper-b ó ttomed 形容詞 〖通例 名詞 の前で 〗1 ｟英 ｠成功確実な, 信頼できる 〈計画 企みなど 〉.2 銅板を張った .