To adorn, cover, or furnish with feathers or plumes, or as if with feathers or plumes.
2
Chiefly of a bird: to arrange and preen the feathers of, specifically in preparation for flight; hence , to prepare for (something).
3
(by extension) To congratulate (oneself) proudly, especially concerning something unimportant or when taking credit for another person's effort; to self-congratulate.