(To). To be conceited of ...; to boast of ... A plume is
a feather, and to plume oneself is to feather one's own conceit.
“Mrs. Bute Crawley ... plumed herself upon her resolute manner of
performing [what she thought right].” —Thackeray: Vanity Fair.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894
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