Competent Crew Quiz · Sails and ropes 
A sailing yacht seen from the side, bow to the right. Shown in red: the bottom corner of the big sail at the outer end of the boom.
What is this corner of the mainsail called?
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Clew. The clew is the back bottom corner of a sail. On a mainsail the outhaul pulls it out along the boom; on a headsail the sheet is tied to it.