expression, ichidan verb
be superior to; surpass; outdo
Idiomatic expression, almost always used in the pattern 〜の右に出る者はいない (there is no one who surpasses ~). The phrase implies that the person or thing is the best in a particular field or skill.
No one in this town surpasses him in cooking skill.
数学にかけては、彼女の右に出る者はいない。
When it comes to mathematics, there is no one who surpasses her.