Lewis Short
(verb) : rūgo, āvi, ātum, 1, and
* A. [1. ruga].
* Neutr., to crease, wrinkle; transf., of the dress (cf. 1. ruga, B.), to become wrinkled or rumpled: vide palliolum ut rugat,Plaut. Cas. 2, 3, 30: pallium, id. Fragm. ap. Gell. 18, 12, 3.
* Act., to wrinkle any thing: frontem,Hier. Ep. 50, 2.—Transf., to corrugate: testae (concharum) rugatae,Plin. 9, 33, 52, § 102.
Charlton T. Lewis, Charles Short, A Latin Dictionary