To be superfluous; to be in excess; to have more than enough (often used as in 'more talent than needed').
彼には才能が有り余るほどある。
He has more talent than he needs.
休日が有り余っているので、新しい趣味を始めた。
I had more free days than I needed, so I started a new hobby.
資金は有り余っているが、使い道を慎重に考えている。
We have excess funds, but we're considering carefully how to use them.