simple past and past participle of reef
Having part of a sail tied up in order to adapt the size of the sail to the force of the wind.
The mainsail was "scandalised" - a nautical mode of describing a sail reefed at both ends[.]
Semi-deployed, with the canopy initially restricted from fully opening, in order to avoid subjecting the canopy to excessive air loads or the payload to excessive g-forces from fully deploying at high airspeed.
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