0 A copper-bottomed plan, deal, or investment can be trusted completely because it is safe and certain to succeed. -- （计划、交易、投资等）安全可靠的，稳妥保险的
a copper-bottomed saucepan 铜底的炖锅
This final set of amendments, which we believe would create a copper-bottomed failsafe, is based on a simple premise.
Surely, copper-bottomed financial guarantees for ticket holders will be required.
There is no "copper-bottomed" productivity to go with the claim and, in consequence, it is said that its acceptance would lead to wage inflation.
There we have a copper-bottomed guarantee, which cannot possibly be breached, in favour of—whom?
Whatever scheme is introduced, it cannot ensure that data in every case carries a copper-bottomed guarantee of accuracy.
The farmers are in a copper-bottomed position, but for how long?
Well, there is nothing more copper-bottomed than that.
The expressions "best endeavour"and"subject to the needs of the business" are hardly copper-bottomed undertakings; they are more like a colander.
