expression, godan verb (-ru)
lose one's edge; become senile; show signs of decline
Idiomatic expression often used for someone whose skills, judgment, or sharpness have deteriorated, especially with age. Can refer to mental decline or loss of professional touch.
あの職人も年を取って、焼きが回ったようだ。
That craftsman seems to have lost his edge with age.
I've been making a lot of mistakes lately; I think I'm losing my touch.