1.Fig. well dressed; of an excellent appearance. (Alludes to a bird that has clean, bright, and flawless feathers.) Well, you are certainly in fine feather today.I like to be in fine feather when I have to give a speech.
2.Fig. in good form; in good spirits. Mary was really in fine feather tonight. Her concert was great!I feel in fine feather and ready to go!
Also, in good or high feather . In excellent form, health, or humor. For example, He was in fine feather, joking with all his visitors. These expressions all allude to a bird's healthy plumage, a usage dating from the late 1500s and no longer very common.