"Wavering voters" refers to individuals who are unsure or undecided about which candidate or political party to support. They may be hesitant and have fluctuating opinions, making it difficult for them to make a firm decision. Full definition
Interview: Alex Salmond Salmond's comments will infuriate those in Westminster preparing for more Scottish devolution in a bid to sway wavering voters in Thursday's referendum. (politics.co.uk)
It is not the kind of thing which wins over wavering voters, but it is a sign of an advanced political strategist and gives a good indication of how Balls wants to shape Labour's image when the 2015 general election comes. (politics.co.uk)
They judged, possibly rightly, that undecided or wavering voters tend to shift to the status quo in the final stages of referendum campaigns. (politics.co.uk)