casting vote

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The chairman have the casting vote.
董事長有決定性的一票。
Mr Clegg’s leadership, now in its third year, has been interesting for reasons of philosophy and policy—not just the casting vote he may soon enjoy.
克萊格在位的三年里，在意識形態(tài)和政策上都有有趣的變化，不僅僅是克萊格手上起決定作為的一票，在最近幾十年里，兩個大黨有意識形態(tài)和政策取向上已有了許多變化。
The singer is reported to have angered fans soon after she began in her role as guest judge, by going against the crowd and refusing to put through a singer called Katie when she had the casting vote.
據(jù)報道這位歌手進(jìn)入評委角色后就和觀眾群對著干，并在她掌握著決定性的一票時拒絕讓一位名叫凱蒂的參賽者通關(guān)。

Not for the first time in Britain's monetary history, the pound may have the casting vote.
ECONOMIST: Interest rates
The committee split four-all on an increase in February and stayed its hand only on the casting vote of the Bank's governor, Eddie George.
ECONOMIST: The budget
If Republicans hold that state, the vice-president's casting vote will keep the Senate red, and more important, ensure that Republicans continue to chair all its committees.
ECONOMIST: Virginia and the Senate: Every vote counts

a single vote, given by the person in charge of a meeting if the number of votes about something is equal, that decides the matter

When a committee has given an equal number of votes for and against a proposal, the chairperson can give a casting vote. This vote decides whether or not the proposal will be passed.