けをらない
hikeo toranai

i-Adjective
Idiomatic Expression

1. not losing out (to); holding one's own (against); comparing favorably (with); being a fair match (for)

数学すうがくにかけてはかれはクラスのだれにもけをらない。
sūgakuni kaketewa karewa kurasuno darenimo hikeo toranai.
When it comes to mathematics, he is second to none in his class.
Other forms: