（一般作be blacked out）extinguish all lights or completely cover windows, especially for protection against an air attack or in order to provide darkness in which to show a film.
（尤指为躲避空袭或放映电影）熄灭所有灯光; 完全遮住窗户。
1.1
subject a place to an electricity failure
使（某地）停电：
Chicago was blacked out yesterday after a freak flood.
芝加哥昨天因为一场罕见的洪水而全城断电。
2
obscure something completely so that it cannot be read or seen
使模糊不清：
the number plate had been blacked out with masking tape.
这辆车的牌照被遮蔽胶带蒙住了。
2.1
(of a television company) decide not to broadcast a disputed or controversial programme