From Longman Dictionary of Contemporary Englishbe in the moneybe in the moneyinformalRICH to have a lot of money suddenly, or when you did not expect to → money
Examples from the Corpus
be in the money• The Blob was in the money now. pity he didn't buy some new clothes.• Followers of our Placepot feature were in the money yet again yesterday with a £98 payout to an £8 stake at Towcester.• He used to be always wanting a loan, and then all at once, he was in the money. 