The term "Big Brother" is commonly used to refer to a powerful, controlling figure who keeps an eye on and exerts influence over others. It can also be used in a more general sense to describe someone who is watching or keeping tabs on another person's actions or behavior.
In its most well-known context, "Big Brother" is the name of a reality television show where contestants live together in a house and are constantly monitored by cameras and microphones. The goal of the game is to vote off other players until only one remains, who then wins a cash prize.
The term originated from George Orwell's dystopian novel "1984," where it refers to an oppressive government that keeps its citizens under constant surveillance and control through propaganda and manipulation. In this context, Big Brother represents the totalitarian regime that rules over the society depicted in the book.
Overall, the phrase "Big Brother" is used to describe a powerful figure who exerts influence or control over others, whether it be through surveillance, manipulation, or other means.