"Major heist" refers to a significant or large-scale theft or robbery. It commonly describes the stealing of valuable items, money, or assets and typically involves careful planning and execution by criminals. Full definition
The World's Most Expensive Stolen Paintings Every year, more than 100,000 paintings are stolen from homes and galleries... this doc dives into the hows and therefores of major heists. (creativeboom.com)
Despite being caught in a firefight that kills and maims only Iraqis, Nick and his sidekick Chris Vail (Jake Johnson) proceed with a planned major heist. (thestar.com)
But our fundraising efforts came to a screeching halt when news broke that Mt Gox, the largest bitcoin exchange, had been the victim of a major heist where about 25 % of all bitcoin in circulation had been stolen. (coindesk.com)