Noun
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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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a rocky region in the southern Transvaal in northeastern South Africa
contains rich gold deposits and coal and manganese
- witwatersrand -
a submerged ridge of rock or coral near the surface of the water
Verb
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reduce (a sail) by taking in a reef
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roll up (a portion of a sail) in order to reduce its area
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lower and bring partially inboard
"reef the sailboat's mast"