chat

Concise Oxford English Dictionary © 2008 Oxford University Press:
chat1

▶verb (chats, chatting, chatted) talk in a friendly and informal way.

■ (chat someone up) informal engage someone in flirtatious conversation.

▶noun an informal conversation.

– origin ME: shortening of chatter.

Concise Oxford English Dictionary © 2008 Oxford University Press:
chat2

▶noun used in names of various songbirds with harsh, chattering calls, e.g. stonechat.

– origin C17: prob. imitative of their calls.