Meaning: If you and another person make up, it means you renew a relationship after an argument or, misunderstanding. It usually means that you have talked to the person and are on good terms now.
Grammar: This phrasal verb cannot usually be separated from its particle, except by the pronoun it, where it is used to refer to a friendship or relationship.
Jo and Lisa made up
They made up
They made it up
They made up it
Example sentence: I'm so glad that you two have talked about your differences and decided to make up.
Synonyms: repair a friendship, make amends, make good, start over, settle your differences, renew a friendship, bury the hatchet