expression, godan verb (-su)
miss a chance; miss an opportunity
Used when someone fails to take advantage of a favorable situation or lets a good opportunity slip by.
せっかくの機会を逃してしまった。
I missed a golden opportunity.
彼は昇進の機会を逃した。
He missed the chance for a promotion.
Similar meaning but uses the loanword チャンス, which can sound slightly more casual or emphatic than 機会.
Compound of 機会 (opportunity) + を (object marker) + 逃す (to let escape, to miss). The verb 逃す is a transitive godan verb meaning 'to miss' or 'to let slip'.