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deep

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adverb American English pronunciation: deep /dip/ 
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comparativedeeper
superlativedeepest
  1. 2
    a long way down from the top or the surface

    men who work deep under the ground

    deep below the ocean's surface

  2. 3
    if people or things are two deep, three deep, etc., there are two, three, etc. rows of them behind or on top of each other

    People were standing three deep at the side of the road to watch the parade.

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