REEF

Definition

1. verb lower and bring partially inboard.
2. verb roll up (a portion of a sail) in order to reduce its area.
3. verb reduce (a sail) by taking in a reef.
4. noun a submerged ridge of rock or coral near the surface of the water.
5. noun a rocky region in the southern Transvaal in northeastern South Africa. — synonyms: Witwatersrand, Rand
6. 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.