This page is about the phrasal verb chat upINFORMAL
to talk to someone in the hope of beginning a romantic relationship with them
hit on (informal), flirt with
- chat up sb Juan is very good at chatting up girls. He knows how to make them laugh.
- chat sb up Mark finds it difficult to chat guys up because he often feels shy, and he doesn't know what to say.
This is typically used in British and Australian English but may be used in other varieties of English too.
Hiroko is chatting the girl up because he wants to
Contributor: Matt Errey