undervote


un·der·vote

U0061850 (ŭn′dər-vōt′)n.1. A ballot that has been cast but shows no legally valid selection in a given race or referendum.2. The number of such ballots cast in an election.

undervote

(ˈʌndəˌvəʊt) n1. (Government, Politics & Diplomacy) a vote that is cast but is legally invalid2. (Government, Politics & Diplomacy) the number of legally invalid votes in an election