feather       
 noun [ C ] uk/ˈfeð.ər/ us/ˈfeð.ɚ/
B2 羽毛;翎毛
one of the many soft, light things that cover a bird's body, consisting of a long, thin, central part with material like hairs along each side
  peacock/ostrich feathers 孔雀/鸵鸟羽毛 
 feather pillows (= those containing feathers) 羽绒枕头 
 The bird ruffled its feathers. 这只鸟竖起了羽毛。 
 - More examples
- The bird has grey feathers with a lighter collar.
- This type of bird is very inconspicuous because of its dull feathers.
- Caged birds sometimes pluck out their breast feathers.
- The birds ruffled their feathers in alarm.
- Do you prefer a feather pillow or a foam pillow?
Idioms     
be (as) light as a featheridiom  轻如鸿毛
to be very light in weight
 a feather in your capidiom  可引以为豪的成就
an achievement to be proud of
  It's a real feather in our cap to be playing in the state championship. 能够参加州锦标赛是真正让我们引以为豪的事。 
 feather      
verb [ T ]  sailing specialized uk/ˈfeð.ər/ us/ˈfeð.ɚ/
 (桨叶与水面平行地)划(桨)
to turn oars (= poles with flat ends used to move a boat) so that the flat parts are horizontal above the water while you prepare for the next pull
 Idiom  
feather your own nestidiom  中饱私囊
to make yourself rich, especially in a way that is unfair or dishonest