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adverb fast pronunciation in American English /fæst/
  1. 1
    quickly
    We drove as fast as we could to the hospital.
    I can’t run very fast.
    Can’t you work any faster?
    Synonyms and related words
    1. a.
      over a short period of time
      The business has grown very fast.
      fast becoming/developing/disappearing etc.: This company is fast becoming a major exporter of computer software.
      Synonyms and related words
    2. b.
      without waiting or delaying
      You need to get help fast!
      We got there as fast as we could.
  2. 2
    firmly and strongly or tightly
    She held fast to the chair and refused to move.
    The van was stuck fast in the mud.

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