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Definitions of reef
  1. noun
    a rocky region in the southern Transvaal in northeastern South Africa; contains rich gold deposits and coal and manganese

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  2. noun
    a submerged ridge of rock or coral near the surface of the water
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  3. verb
    lower and bring partially inboard
    "reef the sailboat's mast"
  4. noun
    one of several strips across a sail that can be taken in or rolled up to lessen the area of the sail that is exposed to the wind
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  5. verb
    reduce (a sail) by taking in a reef
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  6. verb
    roll up (a portion of a sail) in order to reduce its area
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Examples of reef
  • "reef the sailboat's mast"
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