
1) Crimp
Found on
https://www.crosswordclues.com/clue/corrugate

1) Fold 2) Fold into ridges 3) Fold up 4) To wrinkle 5) Turn up
Found on
https://www.crosswordclues.com/clue/corrugate

loosely wrinkled or crumpled
Found on
http://orchidfetish.com/glossary.html

• (a.) Wrinkled; crumpled; furrowed; contracted into ridges and furrows. • (v. t.) To form or shape into wrinkles or folds, or alternate ridges and grooves, as by drawing, contraction, pressure, bending, or otherwise; to wrinkle; to purse up; as, to corrugate plates of iron; to corrugate the forehead.
Found on
http://thinkexist.com/dictionary/meaning/corrugate/
Cor'ru·gate adjective [ Latin
corrugatus , past participle of
corrugare ;
cor-+ rugare to wrinkle,
ruga wrinkle; of uncertain origin.] Wrinkled; crumpled; furrowed; contracted into ridges and furrows.
Found on
http://www.encyclo.co.uk/webster/C/165

loosely wrinkled or crumpled
Found on
http://www.orchidspecies.com/glossary.htm

[
v] - fold into ridges
Found on
http://www.webdictionary.co.uk/definition.php?query=corrugate

corrugate 1. To fold into parallel ridges and troughs, or to fold something; such as, a sheet of cardboard into parallel ridges and troughs. 2. Etymology: from Latin corrugatus, past participle of corrugare, 'to wrinkle'; from com-, 'together, with' + rugare. 'to wrinkle'.
Found on
http://www.wordinfo.info/words/index/info/view_unit/1874/
verb fold into ridges; `corrugate iron`
Found on
https://www.encyclo.co.uk/local/20974
No exact match found.