動詞 corrugate:

1. fold into ridges

1. His brow corrugated with the effort of thinking.
   他皺著眉頭用心地思考。

cor.ru.gate

v.（動詞）
cor.ru.gat.ed,cor.ru.gat.ing,cor.ru.gates
v.tr.（及物動詞）
To shape into folds or parallel and alternating ridges and grooves.
起皺：使起皺，使有平行或變化的邊或槽
v.intr.（不及物動詞）
To become shaped into such folds or ridges and grooves:
使起皺：變得有這種皺、邊或槽：
例句：
.Now the immense ocean . . . sensed the change. Its surface rippled and corrugated where sweeping cloud shadows touched it.(John Updike)
.現(xiàn)在這巨大的海洋…感覺到了這種變化。它的水面濺起水花，流云的影子所籠罩的地方起了皺褶.(約翰·厄普代克)

來源：
Latin corrôg3re corrôg3t- [to wrinkle up]
拉丁語 corrôg3re corrôg3t- [皺起來]
com- [com-]
com- [共同]
rôg3re [to wrinkle] from rôga [wrinkle]
rôg3re [起皺] 源自 rôga [皺紋]

【引伸】
cor.rugate. 或
cor.rugat.ed