Webster's English Dictionary

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grouse

1. grouse \'grau.s\ n or grouse [origin unknown] pl  : any of numerous 
   birds (family Tetraonidae) that have a plump body, stron g feathered legs, 
   and plumage less brilliant than that of pheasants usu. with reddish brown 
   or other protective color and include many important game birds
2. grouse vi [origin unknown] : COMPLAIN, GRUMBLE  - grous.er n