copperfasten

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.

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.

This brings to an end a ten-year campaign by Pol O Murchú and other Irish language activists to copperfasten rights to have Irish language legislation made available […]