noun
defeated country
Refers to a nation that has lost a war. Less common than 敗戦国, but carries the same meaning.
戦敗国は厳しい条件を受け入れざるを得なかった。
The defeated country had no choice but to accept harsh terms.
More common synonym for 'defeated country'. 戦敗国 is a less frequent alternative with the same meaning.
Compound of 戦 (せん, 'war') + 敗 (はい, 'defeat') + 国 (こく, 'country'). The reading せんぱいこく follows standard on'yomi.