The sound of the engines dropped in volume and pitch as the machine accelerated.

We must also listen for the sound of the other shoe to drop: the Clintons' health program.

There came a sound like a gourd dropped on stone.

The sound dropped into absolute silence, for every man on the meadow was holding his breath.

The sound came over them, hovered and dropped in pitch.

The sound dropped to something slightly less than the levels required for ultrasonic brain surgery.

In fact, it was coming from all sides now, the sound of a million tiny things dropping on her roof.

The recorded sound of balls being dropped plays in the background.

After a while the sound eased and dropped, then suddenly there was no sound at all.

My gaze went to Ivy's empty space, and the sound of his wings dropped in pitch.