expression, noun, adverb
as much as possible; unbeatably; unsurpassably
Used to emphasize the highest degree of something, often in comparisons. Functions adverbially or as a noun-like phrase. The variant 負けないぐらい is also common.
See also: 負けないぐらい (まけないぐらい)
彼はプロに負けないくらい上手だ。
He is as skilled as a professional.
今日は昨日に負けないくらい暑い。
Today is as hot as yesterday, if not hotter.