mantener
/manteˈneɾ/ · A1 · verb
to keep
🤲 man- (hand) + tener (to have): hold in the hand = keep, maintain
From Latin manu tenere, to hold in the hand. Same build as English maintain, which came through French. It conjugates like tener: mantengo, mantiene, mantuve. What you keep hold of, you keep going.