copper-bottomed

adjective

1. reliable, esp financially reliable

Word History and Origins

Origin of copper-bottomed¹

from the former practice of coating the bottoms of ships with copper to prevent the timbers rotting

Example Sentences

On the other hand, ministers said Rwanda had given copper-bottomed guarantees and diplomatic assurances of fair treatment.

From BBC

They'll also be given far more legal time to draw up a copper-bottomed case for court.

From BBC

If she comes back with a copper-bottomed hit, she could easily find herself at the outset of a second imperial phase.

From The Guardian

What we said: “It’s held together by sharp, tunefully lovely songwriting, and the likes of Make Me a Song and Everything are copper-bottomed, classy, euphoric electropop.”

From The Guardian

Even if the Oxford paper’s new budgets were copper-bottomed truths, though, they would hardly provide the respite they might seem to.

From Economist