noun
secret leader of a juvenile gang
Slang term for the hidden boss or real power behind a group of delinquents, as opposed to the visible leader (番長).
See also: 番長
あのグループの本当の怖さは、表の番長じゃなくて裏番にあるらしい。
The real scariness of that group seems to lie not with the visible leader but with the secret boss.
noun
competing program in the same time slot
Abbreviation of 裏番組. Refers to a TV or radio program airing on another channel at the same time, often seen as a rival.
See also: 裏番組
裏番の視聴率が上がって、うちの番組は苦戦している。
The ratings of the competing program are up, and our show is struggling.