black out

black out  {v.}

1. To darken by putting out or dimming lights,

In some plays the stage is blacked out for a short time and the actors speak in darkness.

In wartime, cities are blacked out to protect against bombing from planes.

2. To prevent or silence information or communication; refuse to give out truthful news.

In wartime, governments often black out all news or give out false news.

Dictators usually black out all criticism of the government.

Some big games are blacked out on television to people who live nearby.

3.  {informal}

To lose consciousness; faint.