| mark up something mark up (something) 1. to increase the price of something. Farmers have marked up milk prices to cover their costs. I can't believe you marked it up by 400%. 2. to make changes, notes, and corrections on a document. Could you tell me what changes have been made so I can mark up my copy? Take the papers home with you, mark them up, and then bring them in tomorrow and we can discuss them. |