servir
/seɾˈbiɾ/ · A1 · verb
to be of use, to be good for
🍽️ servir = serve + -ir: same Latin root (servire) as servant and service
From Latin servire, to be a servant, which also gave English serve, service and servant. Swap the English -e for Spanish -ir. The useful extra sense: no sirve = it is no use, just as English says it does not serve the purpose.