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The Collaborative International Dictionary
Countervote

Countervote \Coun`ter*vote"\ (koun`t[~e]r*v[=o]t"), v. t. To vote in opposition to; to balance or overcome by voting; to outvote.
--Dr. J. Scott.

Wiktionary
countervote

vb. 1 To vote against. 2 To balance or overcome by voting.

Usage examples of "countervote".

Only once in Carradee's experience had an Elector dared to countervote Queen Siwann.