expression, godan verb (-su)
be a match for; rival; be equal to
Used when two people or things are so outstanding that they stand together as a pair of equals, like two jewels. Often in the pattern AとBが双璧をなす or Aと双璧をなすB.
彼は業界で双璧をなすライバルだ。
He is a rival who stands as an equal in the industry.
These two works are the twin peaks of modern literature.