Fly1  —v. (flies; past flew; past part. Flown) 1 a (of an aircraft, bird, etc.) Move through the air or space under control, esp. With wings. B travel through the air or space. 2 control the flight of or transport in (esp. An aircraft). 3 a cause to fly or remain aloft. B (of a flag, hair, etc.) Wave or flutter. 4 pass, move, or rise quickly. 5 a flee; flee from. B colloq. Depart hastily. 6 be driven, forced, or scattered (sent me flying). 7 (foll. By at, upon) a hasten or spring violently. B attack or criticize fiercely. —n. (pl. -ies) 1 (usu. In pl.) A concealing flap, esp. Over a trouser-fastening. B this fastening. 2 flap at a tent entrance. 3 (in pl.) Space above a stage where scenery and lighting are suspended. 4 act of flying.  fly high be ambitious; prosper. Fly in the face of disregard or disobey. Fly a kite test opinion. Fly off the handle colloq. Lose one's temper. [old english]