1feath·er 
/ˈfɛðɚ/ noun
plural feath·ers /ˈfɛðɚ/ noun [count] : any one of the light growths that make up the outer covering of the body of a bird
▪ duck feathers ▪ tail/wing feathers ▪ downy feathers ▪ a tuft of feathers ▪ a feather pillow = a pillow filled with feathers ▪ Her suitcase felt as light as a feather. [=extremely light] ▪ When I found out I had won, you could have knocked me over with a feather. [=I was extremely surprised or astonished]
▪ duck feathers ▪ tail/wing feathers ▪ downy feathers ▪ a tuft of feathers ▪ a feather pillow = a pillow filled with feathers ▪ Her suitcase felt as light as a feather. [=extremely light] ▪ When I found out I had won, you could have knocked me over with a feather. [=I was extremely surprised or astonished]
a feather in your cap
: an achievement or honor that you can be proud of
▪ The promotion was a feather in his cap.
▪ The promotion was a feather in his cap.
of a feather
: of the same kind or nature — usually used in the phrase birds of a feather ▪ Those two guys are birds of a feather. [=they are very much alike] ◊The expression birds of a feather flock together means that people who are alike tend to do things together.
ruffle feathers — see 1ruffle
— feath·ered /ˈfɛðɚd/ adjective
▪ She likes to refer to birds as “our feathered friends.” ▪ a feathered hat
/ˈfɛðɚd/ adjective ▪ She likes to refer to birds as “our feathered friends.” ▪ a feathered hat
— feath·er·less adjective
▪ a bird with featherless legs
▪ a bird with featherless legs
