Idiom
mark up somethingmark 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.