v.1. To force something from the throat or lungs and out of the mouth by coughing: After years of smoking, he started coughing up blood. The medicine loosened the phlegm so she could cough it up.
2. Slang To pay or hand over something, as money, often reluctantly: Cough up the money or you're going to jail. I know you're short on the rent money, but you'll have to cough it up.
3. Slang To confess or disclose something: When the police arrived, we coughed up the details of the incident. When the lawyers threatened me for not disclosing the tax returns, I coughed them up.