(ruk) noun
The common herd or run; a crowd; also, trash; rubbish. [<Scand. Cf. Norw. ruka heap, crowd.]

(ruk) v.t. & v.i.
1. To wrinkle, rumple, crease, etc.
2. To annoy; ruffle: usually with up.
—noun A wrinkle, crease, or ridge, as in cloth or paper; a wrinkled place. [<ON hrukka wrinkle]