Wiktionary
pitch dark
a. (alternative spelling of pitch-dark English)
Usage examples of "pitch dark".
His matches had run out five full minutes before they reached the light, and the last part of the way had been a nightmare journey in the pitch dark, walking blind and trusting to the feel of the line to tell them that the way ahead was clear.
I can bull's-eye a rat's ass at a thousand meters in the pitch dark.