expression, noun, adverb
as much as possible; unbeatably; unsurpassably
Used adverbially to mean 'to an unbeatable degree' or 'as ... as anyone/anything'. Often follows a noun or adjective to express that something is second to none in that quality.
See also: 負けないくらい (まけないくらい)
彼は誰にも負けないぐらい努力家だ。
He is as hardworking as anyone, unbeatable in his effort.
この店のラーメンは有名店に負けないぐらい美味しい。
This shop's ramen is as delicious as any famous place, unsurpassably good.