一朝被蛇咬，十年怕草绳 Once bitten, twice shy. 一言既出，驷马难追 A word spoken is past recalling. 一见钟情 to fall in love at first sight 一箭双鵰/一举两得 Kill two birds with one stone. 一寸光阴一寸金 Time is money. 一失足成千古恨 The error committed on impulse ...