From 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]