noun
wasted vote; vote for a losing candidate
Refers to a vote that does not contribute to electing a candidate, typically because it was cast for a losing candidate or is otherwise ineffective under the electoral system.
小選挙区制では死票が多くなりやすい。
Under a single-seat constituency system, wasted votes tend to increase.
彼の票は死票になってしまった。
His vote ended up being a wasted vote.