But the success of the pirates was ultimately to prove their undoing.

They hesitated for a fraction of a second, and it proved their undoing.

It was one of these which was to prove our undoing.

This close proximity to the ocean, however, would prove its undoing.

Their marriage was to bring him nothing but misfortune and, in the end, to prove his undoing.

Any predicament which cannot be dealt with this way will prove your undoing.

Instead of that proving my undoing, it led to greater opportunity.

One of these well- meant missiles almost proved their champion's undoing.

He is going to find it, and that will prove his undoing.

But what fueled the last 10 years of growth has proved the region's economic undoing.