frounce
A canker in the mouth of a hawk.
To come to his fyst; She loked as she had the frounce; […]
The hawke had no lystA plait or curl.
Where it comes from
From Middle English frouncen, from Old French froncir "to wrinkle, frown", from Frankish *hrunkiju (“a wrinkle”), from Proto-Germanic *hrunkijō, *hrunkitō (“fold, wrinkle”), from Proto-Indo-European *(s)ker- (“to turn, bend”). Akin to Old High German runza "fold, wrinkle, crease" (German Runzel "wrinkle"), Middle Dutch ronse "frown", Old Norse hrukka "wrinkle, crease" (Icelandic hrukka "wrinkle, crease, ruck"). More at ruck₂.
Adapted from the Wiktionary entry frounce (CC BY-SA 4.0).