noun
a person or organization that exercises total control over people's lives, often in a domineering or intrusive way
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In George Orwell's novel 1984, Big Brother is a symbol of the oppressive government.
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I always feel like Big Brother is watching me with all the security cameras around here.
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Dude, don't be such a Big Brother and let me have some fun.
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The media can sometimes act like Big Brother, constantly monitoring and influencing public opinion.