landslide Syllabification: (land·slide)Pronunciation: /ˈlan(d)ˌslīd/Translate landslide | into French | into German | into Italian | into Spanish Definition of landslide noun 1the sliding down of a mass of earth or rock from a mountain or cliff. 2an overwhelming majority of votes for one party in an election:winning the election by a landslide [as modifier]:a landslide victorylandslide in other Oxford dictionaries Definition of landslide in the British & World English dictionary