Adverb (fukushi), Noun which may take the genitive case particle 'no'
that much; as much; to that extent; only that; that alone; no more than that; that is all (when finished speaking)
Usually written using kana alone
上へ昇れば昇るほど、それだけ墜落の程度は大きくなる。The higher you climb, the greater the fall.
Also written 其れだけ【それだけ】