accelerando

It breaks out again vivacissimo accelerando when Miss Sally (whom we allude to) wakes up, and doesn't appreciate Nestlé's milk.

The mute symphony of the snow was played imperceptibly accelerando.

Accelerando, affrettando (this term implies some degree of excitement also), stringendo, poco a poco animato.

Or we can gradually increase or decrease our tempo, creating accelerando and rallentando effects.

But he did not get to the direction accelerando, for he stopped short, and said abruptly, "Well—what next?"