landslip

{ } n. 1. The slipping down of a mass of land from a mountain, hill, etc. [ 1913 Webster ]

2. The land which slips down. [ 1913 Webster ]

3. An election victory in which the winning candidate receives a substantial majority of the votes, usually meaning at least ten per cent more than any opposing candidate. [ PJC ]

4. Any overwhelming victory. [ PJC ]