1. To throw, as a lance or dart; to hurl; to let fly. 2. To strike with, or as with, a lance; to pierce. [Obs.] Launch your hearts with lamentable wounds. Spenser. 3. To cause to move or slide from the land into the water; to set afloat; as, to launch a ship. With stays and cordage last he rigged the ship, And rolled on levers, launched her in the deep. Pope. 4. To send out; to ...