Reef your sail
Reefing is simply
making a sail smaller. This is usually done in response to
the increasing wind. Reefing down a sail allows you to continue sailing
without being overpowered. This keeps the boat under control and often
makes the journey more comfortable. A sail that is too large for the
wind conditions could be dangerous as it provides too much resistance
for the boat. Putting off reefing, especially for a squall or very
strong winds, is a bad idea. It can result in the sail ripping, the boat
heeling over dangerously or even the mast breaking.