expression, godan verb (-ru, irregular)
have an interest; feel inclined
Expresses a personal inclination or interest toward something or someone. Often used in the pattern 〜する気がある (to be willing to do) or 〜に気がある (to be interested in someone/something).
彼は新しいプロジェクトに気があるようだ。
He seems to have an interest in the new project.
彼女はあなたに気があるみたいだよ。
It looks like she's interested in you.
手伝う気があるなら、遠慮なく言ってください。
If you feel inclined to help, please don't hesitate to say so.