noun
being the only loser; losing by oneself
Describes a situation where one person or team loses while others win or succeed; often used in competitive or comparative contexts.
彼はチームの中で一人負けだった。
He was the only loser on the team.
このゲームでは、一人負けになることが多い。
In this game, I often end up losing by myself.
Compound of 一人 (ひとり, 'one person') and 負け (まけ, 'losing'), literally 'one-person loss'.