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BRB

abbreviation
🔊/ˌbiː ɑː ˈbiː/
🔊/ˌbiː ɑːr ˈbiː/
 (informal)
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  1. (especially in emails, messages sent using an instant messaging service, etc.)
    be right back
    (when you have to leave your computer, etc. for a short time)    马上回来（全写为 be right back，尤用于电邮、即时消息等）Topics Phones, email and the internetc2