c. †to be in face: to be looking one's best (cf. to be in voice at voicen. Phrases 7a). Obsolete.
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the mind > attention and judgement > beauty > pleasing appearance > have pleasing appearance [verb (intransitive)] > specifically of persons > look well or one's best
to be in face1773
1773 O. GoldsmithShe stoops to Conqueri. 8 Is it one of my well looking days, child? Am I in face to day?