Source : Webster's Revised Unabridged Dictionary (1913)

Chirp \Chirp\, v. i. [imp. & p. p. {Chirped}; p. pr. & vb. n.
   {Chirping}.] [Of imitative orgin. Cf. {Chirk}, {Chipper},
   {Cheep}, {Chirm}, {Chirrup}.]
   To make a shop, sharp, cheerful, as of small birds or
   crickets.