Definition of copper-bottomed in English:

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Thoroughly reliable; certain not to fail: a copper-bottomed guarantee
From earlier usage referring to the copper sheathing of the bottom of a ship
More example sentences
  • Mr Brown failed to give a copper-bottomed assurance that Tony Blair would lead the party into the next election, saying only that it was ‘a matter for him’.
  • He can keep quiet and hope Tony will repay loyalty on this occasion - but that has not proved a copper-bottomed guarantee on any issue in the past.
  • He fuelled concern by stating that he could not offer copper-bottomed guarantees that there would not be further losses.

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Line breaks: copper-bottomed

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