さきに (いぜん)
さきに (いぜん) · sakini (izen) · JLPT N1 · noun
before
先 (saki) = ahead in time; 以前 (izen) = 以 from + 前 front: before
さきに is the adverb 'earlier', from 先 (saki, ahead) + に (ni, to). Izen 以前 is the formal compound: 以 (from, since) + 前 (front), so it means 'from an earlier front in time'.