copperfasten

verb2

1. •
   (historical) To protect the timbers of (a ship) with plates of copper secured with copper nails or bolts.

   • She is copper-fastened and copper-bottomed, and a remarkable fine ship. — 1796
2. •
   (UK, figurative) To reinforce, strengthen; to make permanent, embed.

   • We had some striking examples of what happens when a guy gets so big for his britches that any pal of his is automatically a copper-fastened genius. — 1948