Definition of swing vote noun from the Oxford Advanced Learner's Dictionary

 

swing vote

 noun
noun
BrE
 
; NAmE
 
[countable, singular](North American English) Elections
 
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the votes of people who do not always vote for the same political party and have not decided which party to vote for in an election his appeal to the crucial swing vote the shrinking of the swing vote Catholics are important swing votes in this election. See related entries: Elections Wordfindercandidate, constituency, contest, democracy, election, majority, manifesto, poll, referendum, swing vote
See the Oxford Advanced American Dictionary entry: swing vote