(of something bad 坏事 existing or spreading everywhere in a way that cannot be controlled 泛滥的；猖獗的 (of plants 植物 growing thickly and very fast in a way that cannot be controlled 疯长的
Word OriginMiddle English (as a heraldic term): from Old French, literally ‘crawling’, present participle of ramper ‘creep, crawl’, of unknown origin. From the original use describing a wild animal, arose the sense ‘fierce’, leading to the current notion of ‘unrestrained’.