1. past tense of black; made black or dark
2. lost consciousness; fainted
Usage: informal
3. covered or obscured completely

Examples

• The smoke blacked the windows of the building.
• She blacked out during the intense heat wave.
• The storm clouds blacked the sky completely.
• He blacked out the sensitive information with a marker.
• The power outage blacked the entire neighborhood.
• The athlete blacked out after running the marathon.
• Heavy curtains blacked the room from sunlight.