reliable, esp financially reliable

Word Origin for copper-bottomed

from the former practice of coating the bottoms of ships with copper to prevent the timbers rotting
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Examples from the Web for copper-bottomed

  • His copper-bottomed ships came up with and captured six of the enemy, five of which were English prizes.

  • He'd find evidence of lung trouble in a copper-bottomed boiler if it wheezed letting off steam.

    Facts And Fictions Of Life|Helen H. Gardener
  • It's real, copper-bottomed English; you see it on all the old-time wayside hostelries over there.

    The Wrecker|Robert Louis Stevenson and Lloyd Osbourne