crowning touch

This discovery seems to put the crowning touch to that desperate sensation of confinement.

It was just as I was about to put the crowning touch on my efforts in ‘mixing direction’ that the trouble occurred.

And this Thursday midnight, as a crowning touch, three more chums of college days came clattering at the bell.

But it was thoughts of Helen that always gave his misery its crowning touch.

And then, as they went upstairs, Waveney laden with her treasures, the crowning touch was put to her day's pleasure.