n (nautical) 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.
n (nautical, uncountable) The concept of a sail or sails, as if a substance.
n (uncountable) The power harnessed by a sail or sails, or the use of this power for travel or transport.
n A trip in a boat, especially a sailboat.
n (dated, plural "sail") A sailing vessel; a vessel of any kind; a craft.
n (nautical) The conning tower of a submarine.
n The blade of a windmill.
n A tower-like structure found on the dorsal (topside) surface of submarines.
n The floating organ of siphonophores, such as the Portuguese man-of-war.
n (fishing) A sailfish.
n (paleontology) an outward projection of the spine, occurring in certain dinosaurs and synapsids
n Anything resembling a sail, such as a wing.
v 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.
v To move through or on the water; to swim, as a fish or a waterfowl.
v To ride in a boat, especially a sailboat.
v (intransitive) To set sail; to begin a voyage.
v To move briskly and gracefully through the air.
v (intransitive) To move briskly but sedately.
v (card games, transitive) To deal out (cards) from a distance by impelling them across a surface.
n Acronym of snow avalanche impact landform.