However, this act of vengeance proved his final undoing, as Queen Isabel believed the punishment unwarranted and had Rejón replaced by Pedro de Vera.

Mary's next billet was to prove her final undoing.

Mr. Walesa's old trade union, Solidarity, was the final undoing of the Suchocka Government.

That was her final undoing; she could not speak, and she shook her head.

That action was his final undoing.

The decision cuts off into a cliffhanger, where a narrator asks three questions: "Will Professor Chaos' latest plot succeed and be the final undoing of Earth?

This conflict proved to be the company's final undoing.

But the solicitors who were holding a watching brief for Dinah requested a sight of it afterwards, and their report to her proved my final undoing.

Then came the final undoing of ancient Carthage.

And Zooman's final undoing involves his being mistaken for someone else.