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copper-bottomed

adjective
 
 
/ˌkɒp.əˈbɒt.əmd/ US  /ˌkɑː.pɚˈbɑːt̬.əmd/

Definition

UK describes a plan, deal, or investment that can be trusted completely because it is safe and certain to succeedSafe and secureFinancial investments and the stock market having a base made of copper: a copper-bottomed saucepanMetals and metalworkingChemical elements
(Definition of copper-bottomed adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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