From Longman Dictionary of Contemporary Englishdanger moneyˈdanger ˌmoney British English, danger pay American English noun [uncountable] BECadditional money that you are paid for doing dangerous work
Examples from the Corpus
danger money• Such a plea might be successful where the employee had been paid danger money to undertake precisely that risk.• The Grovel Industry, where you get paid danger money because it's so insecure.From Longman Business Dictionarydanger moneyˈdanger ˌmoney extra money paid by an employer to a worker, usually one working in the building industry, who is doing an especially dangerous job → money 