From The Collaborative International Dictionary of English v.0.48:
Sail \Sail\, v. i. [imp. & p. p. Sailed; p. pr. & vb. n. Sailing.] [AS. segelian, seglian. See Sail, n.] 1. 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 the action of steam or other power. [1913 Webster]
2. To move through or on the water; to swim, as a fish or a water fowl. [1913 Webster]
3. To be conveyed in a vessel on water; to pass by water; as, they sailed from London to Canton. [1913 Webster]
4. To set sail; to begin a voyage. [1913 Webster]
5. To move smoothly through the air; to glide through the air without apparent exertion, as a bird. [1913 Webster]
As is a winged messenger of heaven, . . . When he bestrides the lazy pacing clouds, And sails upon the bosom of the air. --Shak. [1913 Webster]