It was faint at first, but began to increase in volume.

The water seemed to increase in power and volume as it reached the net.

The sounds increased in volume, and I felt that they were approaching.

The questions kept up, increasing in volume, until Lisa decided she'd had enough.

Legislation has increased in volume and complexity over the years.

"Instead of trying to increase in volume, there is a great effort to improve design and quality."

As she pulled it off, the foreign sound increased in volume.

But then, behind him, from the camp, came screams which increased in volume and number.

His voice didn't increase in volume, but it became stronger.

They made no attempt to follow, although their laughter increased in volume.