Sails meaning : A piece of fabric attached to a boat and arranged such that it causes the wind to drive the boat along. The sail may be attached to the boat via a combination of mast, spars and ropes. (nautical,uncountable) The concept of a sail or sails, as if a substance. The power harnessed by a sail or sails, or the use of this power for travel or transport. A trip in a boat, especially a sailboat. (plural "sail") A sailing vessel; a vessel of any kind; a craft. The blade of a windmill. A tower-like structure found on the dorsal (topside) surface of submarines. The floating organ of siphonophores, such as the Portuguese man-of-war. A sailfish. An outward projection of the spine, occurring in certain dinosaurs and synapsids Anything resembling a sail, such as a wing. To be impelled or driven forward by the action of wind upon sails, as a ship on water; to be impelled on a body of water by steam or other power. To move through or on the water; to swim, as a fish or a waterfowl. To ride in a boat, especially a sailboat. To set sail; to begin a voyage. To move briskly and gracefully through the air. To move briskly.