My doors is dark enough without your darkening of 'em more.

May eventually cause permanent darkening of the iris to brown.

A general darkening of the skin unrelated to sun exposure.

There was a brief darkening of the light and then a sudden flare.

A further darkening of the sky by a shade.

A sudden darkening of the concrete around him made him look up.

The cold and disorientation were bad enough, but what now began to trouble him more was a subtle darkening of the sky.

A blemish appeared on the woman's face, a mere darkening of the skin, but it grew.

The penumbra causes a subtle darkening of the Moon's surface.

Or perhaps it was a peculiar darkening of the window, which though ever so slight, had caught Pete's tense attention.

Up went one red-gold brow, its darkening of stibium long gone.

Mala just goes pale when she's anxious, with slight darkening of her eyes.

Treatment relieves symptoms and usually reverses any darkening of the skin.

His smile didn't waver, but Caroline could see the sudden darkening of the pale eyes.

Most characteristic is a gradual darkening of the skin and mucous membranes.

Anger showed in the sudden darkening of Martinho's face.

A slight darkening of the medication is expected, but any enemas that turn dark brown should be discarded.

This explains the gradual but slight darkening of the eyes as a bird matures.

There was a sudden darkening of the room, a flutter of all the many candles.

The momentary darkening of her features told him, clearly, what the hedge meant to her.

But lyrical in Taylor does not mean light, and even the progressive darkening of atmosphere is implied at the start.

Radiographic density is the measure of overall darkening of the image.

It was, after all, nothing more than a slight darkening of the green-blue sky to a whitish gray.

A normal darkening of color may occur.

The term industrial melanism refers to the genetic darkening of species in response to pollutants.