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The term to square a yard is used when sailing a square-rigged ship. To "square a yard" is to lay the yards at right angles to the line of the keel by trimming with the braces. ==Explanation== "Squaring a yard" adjusts the position of the square sails so that they are perpendicular to the keel of the ship. This is done in order to "run before the wind', i.e., sail with the wind directly behind the vessel rather than tacking. When a square-rigger is running downwind, and the yards are positioned perpendicular to the line of the keel, both sheets that control the yard (braces) are tied off aft (i.e., straight back), leading to the figurative phrase "Both sheets aft." "Both sheets aft, The situation of a square-rigged ship that sails before the wind, or with the wind right astern. It is said also of a half-drunken sailor rolling along with his hands in his pockets and elbows square."〔 〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Square (sailing)」の詳細全文を読む スポンサード リンク
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