Darkening [verb]

At sunset that day, the refinery’s rooftop will darken, but only for four months.

The on-court clouds that have darkened Toronto’s early season could be clearing.

The bots flag “restatement” as a negative word, which darkens their outlook on a company’s prospects.

The racism he faced in the run up to the record might have darkened Aaron’s joy, but, for him, bitterness never lingered.

That phenomenon occurs when the Moon is farthest away from the Earth to completely cover the Sun, resulting in a ring of light around the darkened moon.

The salt darkens and takes on a metallic taste—hardly something someone would want to sprinkle on food.

Stir in the tomatoes, reduce the heat to medium, cover the skillet and cook, stirring occasionally, until the sauce darkens and thickens and the flavors meld, about 20 minutes.

Once back at the lab, they placed them in a darkened aquarium.

His driver led us into a tunnel and I leaned back as the world darkened.

One of the biggest clues to this fact stares us in the face every time the sun sets and the sky darkens.