[big brother] n (1863) 1: an older brother
2: a man who befriends a delinquent or friendless boy 3 cap both Bs [Big Brother, personification of the power of the state in 1984 (1949) by George Orwell] a: the leader of an authoritarian state or movement b: an all-powerful government or organization monitoring and directing people's actions "data banks that tell Big Brother all about us --Herbert Brucker"