When you get together with your Mandarin-speaking friends, you will undoubtedly liáo tiān which means “to chat.”

Liáo tiān has two characters: 聊天. The first one, liáo, means “to chat,” or “to kill time.” The second character, tiān, means “day,” or “sky,” or “heaven.” Liáo tiān could mean “chatting away the day.”

Another way to say “chat” is liáo liáo (聊聊), which is perhaps more descriptive of the repetitive nature of chat.
Examples of Liao Tian
 
    Qǐng zuòxia gēn wǒmen liáotiān.
    請坐下跟我們聊天｡
    请坐下跟我们聊天｡
    Please sit down and chat with us.

    Tāmen liǎng gè rén xǐhuan liáotiān.
    他們兩個人喜歡聊天｡
    他们两个人喜欢聊天｡
    Those two like to chat.