An idiom meaning to be eager or itching to put one's skills to use; to be keen to perform or show one's ability.
難しい課題を見て、腕が鳴った。
Seeing the difficult task made me eager to tackle it.
大会の話を聞いて、選手たちはみんな腕が鳴っているようだ。
Hearing about the tournament, all the players seem keen to compete.
新しいレシピで腕が鳴るので、ぜひ作ってみたい。
I'm excited to try the new recipe and eager to show my cooking skills.