to become unconscious for a short time synonym faint The driver had probably blacked out at the wheel. related noun blackout
- 1to make a place dark by turning off lights, covering windows, etc. A power failure blacked out the city last night. a house with blacked out windows related noun blackout
- 2to prevent something such as a piece of writing or a television broadcast from being read or seen Some lines of the document have been blacked out for security reasons.