overvote
noun
1. (US, politics) A case in which a voter has marked a ballot for more choices than allowed by the rules
2. (business) A case in which more votes are cast in a voter's name than allowed under the rules
verb
1. (US, politics) To spoil a ballot by marking it for more choices than allowed by the rules
2. (business) To cast more votes than allowed under the rules
3. (obsolete) To outvote or overrule