To increase the price of something between its wholesale and retail phase.(verb)
To add coding to text so that it will display properly on a computer.(verb)
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Use "mark up" in a sentence
"Fromental Halevy, a scion of the Hebrew race, which has furnished so many geniuses to the art world, left a deep impress on his times, not simply by his genius and musical knowledge, which was profound, varied, and accurate, but by the elevation and nobility which lifted his mark up to a higher level than that which we accord to mere musical gifts, be they ever so rich and fertile."
"I always mark up the balls around their equators with angled double dots."