Source : Webster's Revised Unabridged Dictionary (1913)

Churr \Churr\, n. [Cf. {Chirr}.]
   A vibrant or whirring noise such as that made by some
   insects, as the cockchafer, or by some birds, as the
   nightjar, the partridge, etc.

Churr \Churr\, v. i. [imp. & p. p. {Churred}; p. pr. & vb. n.
   {Churr"ing}.]
   To make a churr, as a cockchafer.

         That's the churring of the nightjar.     --Hall Caine.

Churr \Churr\, v. t.
   To utter by churring.

Source : WordNet®

churr
     v : make a vibrant sound, as of some birds [syn: {whirr}]