And 'to make up with someone'. "to make something up" = to invent something (like a story, or an excuse) "Did you just make that up?" "Stop making up excuses" "My Dad used to tell me bedtime stories. He'd make them up off the top of his head." 'to make up with someone' = to become friends again after an argument "We fell out with each other, but life's too short, so we went for a drink and made up with each other" "Let's kiss and make up" (for a romantic relationship) http://teacherluke.co.uk/phrasal-verb-a-day/80-to-make-something-up/