big younger brother大弟弟
Big Tough Brother大哥
Big Bee Brother大蜂兄弟
big older brother大哥哥
big olderer brother大哥哥
Big Crimson Brother is Watching赤红老大哥在看着你呢
Celebrity Big Brother名人老大哥;名人大哥大;名人老大
Variety Big Brother综艺大哥大
China Mountain Big Brother唐山大兄
N-UNCOUNT（不可数名词） People sometimes use Big Brother to refer to a person, government, or organization when they think it has complete control over people and is always checking what they do. (监视公众的)人、政府或机构[表不满]
It's an attempt to control what reaches the public. Big Brother is watching.
这是个控制公众所得信息的企图。“老大哥”正盯着呢。