1. to vote against someone, especially to exclude them from membership in a club or organization
2. to boycott or shun someone socially or professionally

1. a negative vote used to reject someone’s membership or participation

Examples

• The country club decided to blackball his membership application.
• She was blackballed from the organization after the scandal.
• The union threatened to blackball companies that refused to negotiate.
• His controversial statements led to him being blackballed by Hollywood.
• One blackball was enough to deny her entry into the exclusive society.
• The voting process used white balls for approval and blackballs for rejection.
• After the incident, he found himself blackballed from future opportunities.