
1) Fold
Found on
https://www.crosswordclues.com/clue/frounce

• (v. i.) To form wrinkles in the forehead; to manifest displeasure; to frown. • (n.) A wrinkle, plait, or curl; a flounce; -- also, a frown. • (n.) An affection in hawks, in which white spittle gathers about the hawk`s bill. • (v. i.) To gather into or adorn with plaits, as a dress; to form wrinkles in or upon; to curl or frizz...
Found on
http://thinkexist.com/dictionary/meaning/frounce/

A disease of the mouth and throat of birds, most common in pigeons, doves, and raptors
Found on
http://www.encyclo.co.uk/local/22209
Frounce intransitive verb [
imperfect & past participle Frounced ;
present participle & verbal noun Frouncing .] [ Middle English
frouncen ,
fronsen , to told, wrinkle, Old French
froncier , French
froncer , ...
Found on
http://www.encyclo.co.uk/webster/F/81
Frounce noun 1. A wrinkle, plait, or curl; a flounce; -- also, a frown. [ Obsolete]
Beau. & Fl. 2. An affection in hawks, in which white spittle gathers about the hawk's bill.
Booth. Found on
http://www.encyclo.co.uk/webster/F/81

(or Avian Trichomoniasis)
Found on
https://www.encyclo.co.uk/local/22204
No exact match found.