Question

Pitch dark  completely dark, extremely dark. / It was pitch dark when he left the house yesterday. / Look! The sky is becoming pitch dark! / It was a pitch dark and very chilly night.

Accepted Answer

Adverb + Adjective

Collocation	Pitch dark
Type	Adverb + Adjective
Examples	completely dark, extremely dark. / It was pitch dark when he left the house yesterday. / Look! The sky is becoming pitch dark! / It was a pitch dark and very chilly night.

Pitch Dark Adverb Adjective Completely Extremely Left House