0 to use as a replacement for something missing, lost, or lacking:
What he lacks in size, Hayes makes up for in toughness on the basketball court.
Some of these horses have cost me a lot of money, but other ones have made up for it.
For all the skiers yet to make a trip to the mountains this winter, this is the perfect opportunity to make up for lost time (= do what you did not have an opportunity to do earlier).
