From Longman Dictionary of Contemporary Englishrake something ↔ in phrasal verb informalBEARNto earn a lot of money without trying very hard Lou’s been raking in the dollars since he opened his business. If someone opened a burger bar, they’d really rake it in. → rake→ See Verb table
Examples from the Corpus
rake in• His new club was raking the money in.rake it in• What a car! Jasper must be raking it in.• Athletes rake it in these days.From Longman Business Dictionaryrake something → in phrasal verb [transitive] to obtain money, profits etc in large amountsBatman merchandise raked in an estimated $500 million in retail sales while it was hot. → rake→ See Verb table 