luff /luf/

1. The forward edge of a fore-and-aft sail
2. The windward side of a ship
3. The act of sailing a ship close to the wind
4. The after part of a ship's bow where the planks begin to curve in towards the cutwater (also loof)

To turn a ship towards the wind

1. To turn nearer to the wind
2. To move (the jib of a crane) in and out

luffing crane or luffing-jib crane noun

A jib crane with the jib hinged at its lower end to the crane structure so as to allow alteration of its radius of action

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