Used to describe the act of rejecting someone in a secretive and often unfair way. She felt they would blackball her from the club without giving a reason.
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Social Context
Often used regarding social groups, organizations, or communities, rather than formal settings. The local gamers' guild might blackball someone who cheats.
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Negative Connotation
Implies a negative judgment and exclusion based on personal opinions or biases. His political statements led the board to blackball him.