The Collaborative International Dictionary of English v.0.48:

Chewink \Che"wink\, n. (Zool.)
   An american bird (Pipilo erythrophthalmus) of the Finch
   family, so called from its note; -- called also rufous-sided
   towhee, towhee, towhee bunting and ground robin. [Also
   spelled cheewink.]
   [1913 Webster]

WordNet (r) 3.0 (2006):

chewink
    n 1: common towhee of eastern North America [syn: chewink,
         cheewink, Pipilo erythrophthalmus]