Furbish is the language which is spoken by the Furbies. It is similar to English with a different grammar structure. A newly bought Furby starts out speaking entirely Furbish, the unique language with short words, simple syllables, and various other sounds, that all Furbies use, but are programmed to speak less Furbish as they learn more English as they "grow". Throughout a Furby's lifetime, it gradually learns English words and phrases, which it begins to speak in place of Furbish. The more English they learn, the more they "grow", making them more muture. The Furbish phrase "WHOA! Me deep sleep!" would translate into English as "Whoa! I slept for a long time!"