The word "输不起" is formed by combining three characters: 输, meaning "to lose"; 不, meaning "not"; and 起, which here functions as a complement to indicate capability or endurance. When sequenced together, 输不起 literally constructs the meaning "cannot bear to lose", where 输 establishes the action of losing, 不 negates it, and 起 completes the phrase to express an inability to withstand or accept that loss.