blowoutblow·out /ˈbləʊaʊtˈbloʊ-/ noun [countableC] informal1COMMERCEFINANCEwhen a business fails or a financial market falls very quicklyBull markets always end in a speculative blowout.
2FINANCEa very successful period of time for sales or profitsMicrosoft’s performance was slightly better than expectations, but it wasn’t a blowout quarter.
3in oil exploration, when pressure from under the ground causes oil to flow in an uncontrolled waya platform blowout that spilled thousands of barrels of oil into Santa Barbara Channel