From Longman Dictionary of Contemporary Englishdrum something ↔ up phrasal verbGETto get support, interest, attention etc from people by making an effort He travelled throughout Latin America drumming up support for the confederation. The organization is using the event to drum up business (=get more work and sales). → drum→ See Verb table
Examples from the Corpus
drum up• The drums then took up a regular beat as he stalked back to the coffin.• One by one, the concrete weighted drums were winched up and then sent crashing into the sea.drum up business• Cheltenham & Gloucester and the Yorkshire are taking the discount route to drum up business.• They bought a truck and proceeded to drum up business.From Longman Business Dictionarydrum something → up phrasal verb [transitive] if you drum up business or support, you make an effort to get more of itWe have been looking for new ways to drum up business. → drum→ See Verb table 