1. 
   toppling
   [adj] - falling over as if from top-heaviness or lack of support
   Found op http://www.webdictionary.co.uk/definition.php?query=toppling
   
   
2. 
   Toppling
   • (p. pr. & vb. n.) of Topple
   Found op http://thinkexist.com/dictionary/meaning/toppling/
   
   
3. 
   toppling
   (from the article `landslide`) Rotation of a mass of rock, debris, or earth outward from a steep slope face is called toppling. This type of movement can subsequently cause the ...
   Found op http://www.britannica.com/eb/a-z/t/62
   
   
4. 
   toppling
   1) Falling 2) Overthrowing
   Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/toppling/1
   
   

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