verb (reefs, reefing, reefed)
- A chain or range of rocks lying at or near the surface of the water.
- & (South Africa) A large vein of auriferous quartz; hence, any body of rock yielding valuable ore.
- (nautical) An arrangement to reduce the area of a sail in a high wind.
- A reef knot.
Etymology: From rif.
- (nautical) To take in part of a sail in order to adapt the size of the sail to the force of the wind.
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Full Definition of reef