prune (v.)
[of birds] trim feathers with the beak, preen
1H4 I.i.97 [Westmorland to King Henry] Worcester, / Malevolent to you in all aspects, / Which makes him prune himself, and bristle up / The crest of youth against your dignity
Cym V.iv.118 [Sicilius to all, of Jupiter] his royal bird / Prunes the immortal wing
LLL IV.iii.181 [Berowne to all] When shall you see me ... spend a minute's time / In pruning me?