landslip

from WordNet (r) 3.0 (2006)

landslip
    n 1: a slide of a large mass of dirt and rock down a mountain or
         cliff [syn: {landslide}, {landslip}]

from The Collaborative International Dictionary of English v.0.48

Landslide \Land"slide`\, Landslip \Land"slip`\, 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]