Idiom
black out somethingblack out (something)
1.
to stop delivering or receiving electricity.
The power failure blacked out all of northern Illinois.
2.
to keep from being broadcast or printed.
Tonight's game has been blacked out on local television so you have to buy tickets to see it.The local papers blacked out news of the disaster.
Etymology: based on the literal meaning of black something out (= to keep something from being seen by covering it with black)