noun
victorious nation; victor nation
Refers to a country that has won a war, often used in historical or political contexts.
戦勝国は戦後復興に力を注いだ。
The victorious nations focused on postwar reconstruction.
敗戦国 means 'defeated nation', the opposite of 戦勝国.
Compound of 戦勝 (victory in war) + 国 (country).