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