noun
plural -ers
[count] :any one of the light growths that make up the outer covering of the body of a bird
a feather in your cap
an achievement or honor that you can be proud of
of a feather
of the same kind or nature - usually used in the phrase birds of a feather
The expression birds of a feather flock together means that people who are alike tend to do things together.
ruffle feathers
verb
-ers; -ered; -ering
[+ obj] :to put a feather in or on (something)
feather your (own) nest
to make yourself richer in a dishonest or improper way :to do things to increase your own wealth, comfort, etc.
tar and feather