Blackout (noun)

1. A temporary loss of consciousness or memory.
2. A power outage that causes a loss of electricity to an area.
3. A period of time during which all lights must be turned off to conceal a location from enemy aircraft.

Origin:

The word blackout comes from the phrase "black out" which means to lose consciousness or to turn off the lights. it can refer to a temporary loss of consciousness or a power outage.

Examples:

1. The blackout lasted for several hours.
2. He had a blackout and couldn't remember what happened.
3. The blackout caused by the storm left thousands without power.
4. The blackout curtains kept the room completely dark.
5. During the blackout, all lights were turned off to avoid being seen by enemy planes.