sail
noun
seɪl 
seɪl 
1 [countable, uncountable] a sheet of strong cloth which the wind blows against to make a boat or ship travel through the waterAs the boat moved down the river the wind began to fill the sails.a ship under sail (= using sails)in the days of sail (= when ships all used sails)She moved away like a ship in full sail (= with all its sails spread out).The vessel can be propelled by oars or sail (= sails).2 [singular] a trip in a boat or shipWe went for a sail.a two-hour sail across the bay3 [countable] a set of boards attached to the arm of a windmillIdioms
