Possible Definitions:
1. Bird (n.) Orig., a chicken; the young of a fowl; a young eaglet; a nestling; and hence, a feathered flying animal (see 2).
2. Bird (n.) A warm-blooded, feathered vertebrate provided with wings. See Aves.
3. Bird (n.) Specifically, among sportsmen, a game bird.
4. Bird (n.) Fig.: A girl; a maiden.
5. Bird (v. i.) To catch or shoot birds.
6. Bird (v. i.) Hence: To seek for game or plunder; to thieve.