luff Syllabification: (luff)Pronunciation: /ləf/Definition of luff noun the edge of a fore-and-aft sail next to the mast or stay. verb [with object] steer (a sailing vessel) nearer the wind to the point at which the sails just begin to flap:I came aft and luffed her for the open sea obstruct (an opponent in yacht racing) by sailing closer to the wind. Origin: Middle English: from Old French lof, probably from Low Germanluff in other Oxford dictionaries Definition of luff in the British & World English dictionary