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pillage [pillage 词源字典]: pillage: [14] The origins of pillage are disputed. It comes from Old French pillage, a derivative of piller ‘plunder’, but there the consensus breaks down. Some say that piller (which also meant ‘tear up’) was based on pille ‘rag, cloth’, which may have been descended from Latin pilleus ‘felt cap’; others that it came from a Vulgar Latin verb *pīliāre, a derivative of Latin pīlum ‘javelin’ (source of English pile ‘supporting stake’); and others again that it came from Latin pilāre ‘remove hair’ (source of English peel [13], which originally meant ‘plunder’), a derivative of pilus ‘hair’ (source of English pile ‘nap’), in which case it would be roughly parallel in inspiration to colloquial English fleece ‘rob’.
[pillage etymology, pillage origin, 英语词源]
rag (n.): scrap of cloth, early 14c., probably from Old Norse rögg "shaggy tuft," earlier raggw-, or possibly from Old Danish rag (see rug), or a back-formation from ragged, It also may represent an unrecorded Old English cognate of Old Norse rögg. In any case, from Proto-Germanic *rawwa-, from PIE root *reue- (2) "to smash, knock down, tear up, uproot" (see rough (adj.)).

As an insulting term for "newspaper, magazine" it dates from 1734; slang for "tampon, sanitary napkin" is attested from 1930s (on the rag "menstruating" is from 1948). Rags "personal clothing" is from 1855 (singular), American English. Rags-to-riches "rise from poverty to wealth" is attested by 1896. Rag-picker is from 1860; rag-shop from 1829.
rugae (n.): plural of ruga (1775), from Latin ruga "a wrinkle in the face," from PIE *rug-, variant of *reue- (2) "to smash, knock down, tear up, dig up, uproot" (see rough (adj.)).