reef

US /riːf/
UK /riːf/
"reef" picture
1.

a ridge of rocks or sand, often of coral, near the surface of the sea

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The ship ran aground on the coral reef.
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Divers explored the vibrant marine life around the reef.
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shoalbankridgebarcay
1.

reduce the area of (a sail) by folding or rolling part of it and securing it to the spar or mast

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The sailors had to reef the sails as the storm approached.
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We decided to reef the main sail to reduce speed.
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shortenreducefurltake in
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coral reef