make up is a verb meaning "form or compose". It carries 9 recorded senses.
form or compose
“This money is my only income”
“The stone wall was the backdrop for the performance”
“These constitute my entire belonging”
“The children made up the chorus”
“This sum represents my entire income for a year”
“These few men comprise his entire army”
do or give something to somebody in return
“Does she pay you for the work you are doing?”
make up work that was missed due to absence at a later point
“I have to make up a French exam”
“Can I catch up with the material or is it too late?”
concoct something artificial or untrue
adjust for
“engineers will work to correct the effects or air resistance”
come to terms
“After some discussion we finally made up”
Definitions, synonyms and semantic relations for make up come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.