plume

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plume oneself

Congratulate oneself, boast, as in He plumed himself on his victory. This idiom transfers the bird's habit of dressing its feathers to human self-satisfaction. [First half of 1600s]
See also: plume

borrowed plumes

a pretentious display not rightly your own.
This phrase refers to the fable of the jay which dressed itself in the peacock's feathers.
See also: borrow, plume