swing vote (swingvotes)

• 1.  

  N-COUNT（可数名词） In a situation when people are about to vote, the swing vote is used to talk about the vote of a person or group which is difficult to predict and which will be important in deciding the result. (对选举结果起决定性作用的)关键选票 [美国英语] [journalism]

  例：

  ...a Democrat who holds the swing vote on the committee.

  ...一位在该委员会的选举中握有关键选票的民主党人。