Compounds of 一大

• 一大
  (n) one large ...
  a great ...
  (P)
• 一大事
  (n) serious affair
• 一大決心
  (n,vs) momentous (crucial) decision
• 一大旋風
  (n) great sensation
  taking something by storm
  making a splash
• 一大鉄槌
  (n) dealing a hard (heavy, crushing) blow (to)
• 一大転機
  (n) significant turning point