The Collaborative International Dictionary of English v.0.48:

Dunlin \Dun"lin\, n. [Prob. of Celtic origin; cf. Gael. dun hill
   (E. dune), and linne pool, pond, lake, E. lin.] (Zool.)
   A species of sandpiper (Tringa alpina); -- called also
   churr, dorbie, grass bird, and red-backed sandpiper.
   It is found both in Europe and America.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

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.
   [Webster 1913 Suppl.]

The Collaborative International Dictionary of English v.0.48:

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.
   [Webster 1913 Suppl.]

The Collaborative International Dictionary of English v.0.48:

Churr \Churr\, v. t.
   To utter by churring.
   [Webster 1913 Suppl.]

WordNet (r) 3.0 (2006):

churr
    v 1: make a vibrant sound, as of some birds [syn: churr,
         whirr]