plume oneself
plume oneself {v. phr.}, {literary}
To be proud of yourself; boast.
He plumed himself on having the belle of the ball as his date.
He plumed himself on his successful planning in the election.
She plumed herself on the grace with which she sat on a horse.
Compare: PRIDE ONESELF ON.
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Source: A Dictionary of American Idioms
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