I set about reefing the sail, reducing its area to lessen the strain.
我准备收帆，减少帆面积以降低张力。

Arthroscopic lateral retinacular release and medial patellar retinacular reefing with tiny cut in treatment of chondroma patella
关节镜下多方位小切口松解紧缩髌支持带治疗髌骨软化症

The boat will be more difficult to manage and you should seriously consider reefing.
船变得难于控制，应该真正考虑缩帆得事。