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fast

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adverb American English pronunciation: fast /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.

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