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fast

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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?

    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.

    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.

    Synonyms and related words for this sense of fast

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