2to communicate with several people in a chat room on the Internet
chat somebody ↔ up
British Englishinformalto talk to someone in a way that shows you are sexually attracted to them:
I spent the evening chatting up Liz.
WORD FOCUS: talk WORD FOCUS: talk chat/natterBritish Englishto talk in a friendly way about things that are not very important gossipto talk about other people's private lives drone on/go onBritish English/hold forthwaffleBritish Englishrambleto talk for too long in a boring way whisperto talk very quietly mumble/murmurmutterto talk in a way that is difficult to heartalk ➔ See alsotalk
Definition from the Longman Dictionary of Contemporary English Advanced Learner's Dictionary.