casting vote 
noun
An extra vote given by a chairperson to decide an issue when the votes on each side are equal.The second thing I want to talk about is the meeting issue and the casting vote....
- His troubles within the organisation culminated in 1930, when he had to rely on his own vote and the casting vote of the national secretary to survive.
- A casting vote of the Chairman decided the issue.
Origin
Early 17th century: from an obsolete sense of cast 'turn the scale'.
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