Luff

What is Luff?

Luff definition and meaning on Dictionary terms:
noun Nautical.
the forward edge of a fore-and-aft sail.

verb (used without object)
to bring the head of a sailing ship closer to or directly into the wind, with sails shaking.
(of a sail) to shake from being set too close to the wind: The sail luffed as we put about for port.
to raise or lower the outer end of the boom of a crane or derrick so as to move its load horizontally.

verb (used with object)
to set (the helm of a ship) in such a way as to bring the head of the ship into the wind.
to raise or lower the outer end of (the boom of a crane or derrick).

 

reference: https://www.dictionary.com/browse/luff

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