But once their prayers were said, the ballet's tone darkened.

As it proceeds, its tone darkens and its emotions deepen.

He was smiling good-naturedly, and no slightest threatening tone darkened his voice.

She went on, her tone darkening, Jerry said nothing.

But as the Harpers' fortunes continue to decline, the light tone darkens precipitously.

"That they haven't," Sir George confirmed, and his tone darkened once more.

The new leaves assume a reddish tone then darken to an almost black-purple.

Gradually the tone darkens, as horrors pile up, identities dissolve into one another and death approaches.

In the 1940s the tones darken, and the figures grow stranger.

As the film goes along, its tone darkens.