(colloquial) To make a show of bravery despite one's fears; to put on a brave face. / (idiomatic, US) To speak of something despite having little knowledge of it.

Alternative spelling of pitch-dark

(physics) The temperature-dependent current that flows in a photodetector when no light is shining on it.

(see usage notes) The period of European history encompassing (roughly) 476–1000 CE. / (Ancient Greece) The Greek Dark Ages (c. 1100–750 BCE). / The dark ages of Cambodia (c. 1450–1863).

Having a relatively dark skin.

Alternative form of dark lantern

Absolutely dark or black; as dark as pitch.

After nightfall; at night.

(Australia, rhyming slang) A bookmaker's clerk. / (Australia, rhyming slang) A shark.

Before night begins to fall. From morning until evening. In the daytime before sunset.