expression, godan verb (-ru)
itching to use one's skills; eager to show one's ability
Idiomatic expression used when someone is excited or impatient to demonstrate their competence, often after a period of inactivity or when a suitable opportunity arises.
久しぶりの試合で、選手たちは腕が鳴っている。
With the first match in a long time, the players are itching to show their skills.
新しいプロジェクトの話を聞いて、彼は腕が鳴る思いだった。
Hearing about the new project, he felt eager to put his abilities to use.