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• n  (nautical) a line (rope or chain) that regulates the angle at which a sail is set in relation to the wind

• The late King's sailing master, Sir Philip Hunloke, tried to buy the Britannia's mainsheet, 70 fathoms long, but souvenir hunters outbid him.
• John Marshall, the mainsheet trimmer on Liberty, said after the race, "There is a speed difference in these two yachts like I have never seen.
• Tuck still objected to the slant of the deck, but recovered sufficiently to have a tug of war with the mainsheet.

• sheet
• tack
• weather sheet
• shroud