Source : Webster's Revised Unabridged Dictionary (1913)

Caw \Caw\ (k[add]), v. i. [imp. & p. p. {Cawed} (k[add]d); p.
   pr. & vb. n. {Cawing}.] [Imitative. [root]22 Cf. {Chough}.]
   To cry like a crow, rook, or raven.

         Rising and cawing at the gun's report.   --Shak.

Caw \Caw\, n.
   The cry made by the crow, rook, or raven.

Source : WordNet®

caw
     n : the sound made by corvine birds
     v : utter a cry, characteristic of crows, rooks, or ravens