Submitted by György Chityil ... on Fri, 01/19/2018 - 20:21 Hierarchy: NounDescription: Something which, once it starts{{italbrac|figuratively}} going downhill, is unstoppable until it reaches the bottom.Ngram: tobogganNgram Text: tobogganSource: WiktionaryIssue: 0Wiktionary tag: italbracNgram Count: 1