An idiom meaning 'second to none' — someone or something so excellent there is no equal.
彼の寿司はうまさでは右に出る者はいない。
No one can beat his sushi in taste.
この会社の技術力は業界でも右に出る者はいないと評判だ。
This company's technological capabilities are reputed to be second to none in the industry.
あの先生は教え方が上手で、右に出る者はいない。
That teacher is excellent at teaching; there is none better.